One group of 40 students has a mean score 75in exam.A second group of 50 students has a mean score of 60.A third group of 30 students has a mean score of 85.Find the mean of all 120 stidents

Answer:

the answer is 147

Step-by-step explanation:

I have attached a picture with the work. Hope this helps :)

The answer is 147 0 Remainder

EXPLANATION: MY A$* (not that hard lol)

Step 1:

Start by setting it up with the divisor 3 on the left side and the dividend 441 on the right side like this:

Step 2:

The divisor (3) goes into the first digit of the dividend (4), 1 time(s). Therefore, put 1 on top:

Step 3:

Multiply the divisor by the result in the previous step (3 x 1 = 3) and write that answer below the dividend.

Step 4:

Subtract the result in the previous step from the first digit of the dividend (4 - 3 = 1) and write the answer below.

Step 5:

Move down the 2nd digit of the dividend (4) like this:

Step 6:

The divisor (3) goes into the bottom number (14), 4 time(s). Therefore, put 4 on top:

Step 7:

Multiply the divisor by the result in the previous step (3 x 4 = 12) and write that answer at the bottom:

Step 8:

Subtract the result in the previous step from the number written above it. (14 - 12 = 2) and write the answer at the bottom.

Step 9:

Move down the last digit of the dividend (1) like this:

Step 10:

The divisor (3) goes into the bottom number (21), 7 time(s). Therefore put 7 on top:

Step 11:

Multiply the divisor by the result in the previous step (3 x 7 = 21) and write the answer at the bottom:

Step 12:

Subtract the result in the previous step from the number written above it. (21 - 21 = 0) and write the answer at the bottom.

You are done, because there are no more digits to move down from the dividend.

The answer is the top number and the remainder is the bottom number.

Therefore, the answer to 441 divided by 3 calculated using Long Division is:

147

0 Remainder

ur welcome dummyboi

The A and B are independent then P(A∣B) = P(A).Since P(A) = 0.60 and P(A∣B) = 0.60, it can be said that A and B are not independent.

P(A∣B)= 0.60 (Round to two decimal places as needed.)b. P(A∣B ′ )= 0.45 (Round to two decimal places as needed.)c. P(A ′ ∣B ′ )= 0.20 (Round to two decimal places as needed.)d. Are events A and B independent? A and B are not independent.Explanation:A∣B means that the event A occurs when the event B occurs. P(A∣B) can be defined as the probability of A happening given that B has already occurred. By definition, A and B are independent if P(A∣B) = P(A).a. P(A∣B)= P(A∩B)/P(B)0.60 = 0.36/0.60= 3/5 b. P(A∣B ′ )= P(A∩B ′ )/P(B ′ )0.45 = 0.27/0.60= 9/20c. P(A ′ ∣B ′ )= P(A ′ ∩B ′ )/P(B ′ )0.20 = 0.12/0.60= 1/5d. If A and B are independent then P(A∣B) = P(A).Since P(A) = 0.60 and P(A∣B) = 0.60, it can be said that A and B are not independent.

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If 23 fifth grade textbooks were used for the tower and the tower was 57. 1 cm tall, how many sixth grade textbooks were used?

To find out how many sixth grade textbooks were used, divide 57.1 cm by the height of one sixth grade textbook. Then multiply that number by 23 to get the total number of sixth grade textbooks used.

If you want to find out how many sixth grade textbooks were used for the tower, you first have to calculate the height of one sixth grade textbook. Once you have that measurement, you can divide 57.1 cm by that height to get the number of sixth grade textbooks used in the tower. To get the total number of textbooks used, you then need to multiply the number of textbooks per tower by 23, since 23 fifth grade textbooks were used. In other words, if the height of one sixth grade textbook is h, the number of sixth grade textbooks used is (57.1 cm / h) * 23. This equation gives you the number of sixth grade textbooks used, based on the height of one sixth grade textbook and the total height of the tower.

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Vοlume οf cylinder is  and when height tripled then its vοlume alsο tripled  but when radius tripled its vοlume becοme  which is nineth times οf οriginal vοlume.

Vοlume is a mathematical cοncept that refers tο hοw much three-dimensiοnal space an οbject οr clοsed surface οccupies.

Vοlume οf cylinder = πr²h

= π × 4² × 10

= 160π m³

When the height is tripled, h becοmes 3h

So, new height = 3 × 10 = 30m

Volume of a Cylinder (when height is tripled) = π × (4)² × 30

= π × 16 × 30

= 480π m³

When height is tripled then vοlume alsο tripled.



When the radius is tripled, r becοmes 3r

So, new radius = 3 × 4 = 12m

Volume of a Cylinder (when radius is tripled)

= π × (12)² × 10

= 1440 m³

But when radius is tripled the vοlumes becοme Nine times.

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Answer:

250 ml

Step-by-step explanation:

300ml + 250ml =550ml

550ml - 200ml=350ml

350ml - 150ml + 100ml=300ml

300ml - 50ml=250ml

Answer: line A

Step-by-step explanation:

2x is the slope and -1 is the y-intercept
2x for the slope, also 2/1x (meaning rising up 2 places for every one place on the x axis).
Line A is the only line who has 2x for the slope.
ANSWER: LINE (A)

Answer:

Line a

Step-by-step explanation:

The equation is y= 2x - 1 so....

Slope = 2

Y-intercept = -1

Slope can be put as Rise/ Run ( up/ side)

This means the slope can be written as 2/1

Line a has a slope of 2/1 from the point -1 so the answer is line a

The average rate of change of g(x) from x = 3 to x = 7 is -5.

To find the average rate of change of the function g(x) = -x² + 4x + 2 over the interval [3, 7], we need to calculate the change in the function values over this interval and divide by the length of the interval.

The change in the function values between x = 3 and x = 7 is:

g(7) - g(3) = (-7² + 47 + 2) - (-3² + 43 + 2) = (-49 + 28 + 2) - (9 + 12 + 2) = -20

Therefore, the average rate of change of g(x) over the interval [3, 7] is:

average rate of change = change in function values / length of interval

= -20 / (7 - 3)

= -5

This means that on average, the function g(x) decreases by 5 units for every 1 unit increase in x over the interval [3, 7].

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Answer:

Below

Step-by-step explanation:

Density =       mass  

                     volume

Density = 21.1 kg / 9.37 m^3 = ~  2.3 kg/m^3

Answer:

Option C: The skaters path intersect twice, but only one of those points is inside the rink.

Step-by-step explanation:

Coordinates of center of ice rink: (0,0) Radius of ice rink circle = 35 m

We know that the equation of a circle with center coordinates (a,b) and radius of (r) is given as; (x - a)² + (y - b)² = r²

Thus, the total area on which the skaters are skating will be given by the equation;

x² + y² = 35²

Now, we are told the path along which Susan is skating is modeled by the equation: y = 6x - x² - 5

While Luke starts at (10, –21) and skates along a path that can be modeled by a quadratic function with a vertex at (8, –9)

From equation of a parabola, the path along which like is skating can be modeled by;

(x - 8)² = 4a(y + 9)

To find a, we will substitute the coordinate started at to get;

(10 - 8)² = 4a(-21 + 9)

4 = 4a × -12

Divide both sides by 4 to get;

a = -1/12

Thus;

(x - 8)² = 4(-1/12)(y + 9)

(x - 8)² = (-1/3)(y + 9)

This gives: 3(x - 8)² = -(y + 9)

I've drawn the graph on demos and attached it.

From the graph we can see that the skaters points intersect twice but one is inside the rink circle while the other is outside the rink circle. The point at which they intersect outside the rink was slightly cropped out because of size. But it is clearly seen that they are both approaching point of intersection.

Thus, correct answer is Option C.

There were 332500 tourists who traveled to Nepal in 2011.

"A method to find a single unit value from a multiple unit value and to find a multiple unit value from a single unit value."

We always count the unit or amount value first and then calculate the more or less amount value.

For this reason, this procedure is called a unified procedure.

Many set values ​​are found by multiplying the set value by the number of sets.

A set value is obtained by dividing many set values ​​by the number of sets.

Number of tourists in 2010 = 95% of number of tourists in 2009

= 0.95 x 250000

= 237500

Number of tourists in 2011 = 140% of number of tourists in 2010

= 1.4 x 237500

= 332500

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Tom will arrive in London at 4.10 pm, after travelling 140 miles at an average speed of 50 mph.

The formula to calculate the time taken is: Time = Distance/Speed

Using Tom's assumption that the coach is travelling at an average speed of 50 mph, the time taken for the journey from Newport to London can be calculated as follows:

Time = 140 miles/50 mph = 2.8 hours

Therefore, Tom will arrive in London at 1.30 pm + 2.8 hours = 4.10 pm.

To put this in context, it means that the coach will travel at an average speed of 70 km/h, covering a distance of 224 km in 2.8 hours. This is equivalent to covering 80 km in an hour.

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Answer: y - intercept is c = 4.

Step-by-step explanation:

The line equation is 3x + y = 4.

The slope-intercept form of the line equation is y = mx + c.

Where m is the slope of line c is the y-intercept.

The equation is 3x + y = 4.

subtract 3x  from each side.

y - intercept is c = 4.

The lateral area of this paper weight is 61.42 sq inches.

Every solid object's lateral area may be calculated using the lateral area formula. Every figure's lateral area only includes the non-base faces. Calculating the lateral surface area of various forms, such as a cuboid, cube, cylinder, cone, or sphere, is made easier with the use of lateral area formulae. The object's base and the face parallel to the base are not included in the lateral area.

The surface area of the composite figure is the addition of the area of all the shapes.

The area of triangle with height 3.5 in is:

A1 = 1/2(6.5)(3.5)

A1 = 11.375 sq. in.

There are two such triangles thus, 2A1 = 2(11.375) = 22.75.

The area of the two triangle with height 6.5 in is:

A2 = 2(1/2)(4.3)(6.5) = 27.95 sq. in.

The area of the rectangle is:

A3 = (l)(w)

A3 = (6.5)(4.2) = 27.3 sq. in.

The total lateral area is:

LA = 11.375 + 22.75 + 27.3 = 61.42 sq inches.

Hence, the lateral area of this paper weight is 61.42 sq inches.

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The proportional equation us y = 2.5x and the constant is 2.5

6 bottles would have a volume of 15 liters.

An equation is an expression containing numbers and variables linked together by mathematical operations such as addition, subtraction, division, multiplication and exponents.

Let y represent the volume in liters and x represent the number of bottles.

A proportional relationship is in the form:

y = kx; where k is the constant of proportionality.

From the table, using the value (2, 5):

y = kx

substituting:

5 = 2k

k = 2.5

The proportional equation us y = 2.5x and the constant is 2.5

For 6 bottles:

y = 2.5(6) = 15 liters

6 bottles would have a volume of 15 liters.

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The value of angle Z is 40 degrees. (Option 3). In this problem, we are given that three lines intersect at point P and we need to find the value of angle Z.

We know that angle X is 65 degrees and angle Y is 75 degrees. We also know that all six angles formed by the intersection of the three lines add up to 360 degrees.

Using these facts, we can set up an equation as

2X + 2Y + 2Z = 360.

We can simplify this equation to

X + Y + Z = 180.

We can then substitute the given values of X and Y to get

65 + 75 + Z = 180.

Simplifying this equation, we get Z = 40, which means Z is equal to 40 degrees.

Therefore, the answer is option C.

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Complete Question:

In the figure, 3 lines intersect at point P. If x = 65 and y = 75, what is the value of z?

Random assignment in this experiment is important to avoid bias.

By randomly assigning participants to diets with different levels of protein, the researchers are ensuring that any differences in outcomes are due to the diet, and not because of any individual characteristics of the participants. Random assignment helps to ensure that the groups being compared in the experiment are similar and that any differences seen in outcomes are due to the protein level and not other factors. Random assignment helps to eliminate any bias that could be introduced if the participants were assigned to diets based on their own characteristics. This helps to ensure that the results of the experiment are valid and accurate.

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A cone with the same height and radius as a cylinder has a volume of 24 cubic inches.

If a cylinder has a volume of 72 cubic inches, we can use the formula for the volume of a cylinder to find its height and radius. The formula for the volume of a cylinder is V = πr^2h, where V is the volume, r is the radius, and h is the height.

So, we have:

72 = πr^2h

We can solve this equation for h:

h = 72/(πr^2)

Now, we can use the formula for the volume of a cone to find the volume of a cone with the same height and radius as the cylinder. The formula for the volume of a cone is V = (1/3)πr^2h, where V is the volume, r is the radius, and h is the height.

So, we have:

V = (1/3)πr^2(72/(πr^2))

Simplifying this equation, we get:

V = 24

Therefore, the volume of a cone with the same height and radius as the cylinder is 24 cubic inches.

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a)   result does not contradict

To show that p(your winning) <1/2, we need to consider that the last piece you have on your board could land on various positions. Depending on the position, your opponent could end up winning even if you land a higher value on the dice. Therefore, the probability of your winning is less than 1/2. This shows that a double is not called for.Exercise 3.1 states that the expected count on a backgammon roll is 8 6 1, exceeding the 8 points you need to win. This is true since the expected count means the average count you are expected to land on if you roll the dice. It does not mean that every roll will result in a count higher than 8, and it does not mean that you will always win. The expected count is simply a statistical measure of the possible outcomes of rolling the dice. Therefore, this result does not contradict the fact that p(your winning) <1/2.

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The prοbabilities fοr all pοssible values οf the randοm variable x are:

P(x) = 0.1785 P(x) = 0.3911 P(x) = 0.3462 P(x) = 0.1124 P(x) = 0.0118.

The jοint prοbability is the likelihοοd οf twο (οr mοre) events. The jοint prοbability distributiοn is the sum οf the jοint prοbabilities οf twο οr mοre randοm variables. Fοr instance, P is the fοrmal nοtatiοn fοr the cοmbined prοbability οf events A and B. (A and B)

We can use the fοllοwing fοrmula tο find the prοbabilities fοr all pοssible values οf the randοm variable, x, in a binοmial situatiοn where n = 4 and = 0.35:

P(x) = (n chοοse x)[tex]* \pi ^x * (1-\pi)^{(n-x)[/tex]

where "n select x" is the binοmial cοefficient, which equals n! / (x! * (n-x)!).

Then, fοr x = 0, 1, 2, 3, and 4, we can cοmpute P(x) as fοllοws:

P(x=0) = (4 chοοse 0) [tex]* 0.35^0 * 0.65^4 = 0.1785[/tex]

P(x=1) = (4 chοοse 1) [tex]* 0.35^1 * 0.65^3 = 0.3911[/tex]

P(x=2) = (4 chοοse 2) [tex]* 0.35^2 * 0.65^2 = 0.3462[/tex]

P(x=3) = (4 chοοse 3) [tex]* 0.35^3 * 0.65^1 = 0.1124[/tex]

P(x=4) = (4 chοοse 4) [tex]* 0.35^4 * 0.65^0 = 0.0118[/tex]

When we rοund these numbers tο fοur decimal places, we get:

P(x=0) = 0.1785

P(x=1) = 0.3911

P(x=2) = 0.3462

P(x=3) = 0.1124

P(x=4) = 0.0118

As a result, the prοbabilities fοr all pοssible values οf the randοm variable x are as fοllοws:

P(x=0) = 0.1785

P(x=1) = 0.3911

P(x=2) = 0.3462

P(x=3) = 0.1124

P(x=4) = 0.0118

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Answer:

Hi

Step-by-step explanation:

SOLUTION STEPS

−10+30+58=9−54×50−4=

Add −10 and 30 to get 20.

20+58=9−54×50−4

Add 20 and 58 to get 78.

78=9−54×50−4

Multiply 54 and 50 to get 2700.

78=9−2700−4

Subtract 2700 from 9 to get −2691.

78=−2691−4

Subtract 4 from −2691 to get −2695.

78=−2695

Compare 78 and −2695.

The correct answer is option 1) "There is no correlation between the amount of sleep and the number of calories burned."

Based on the information provided, the yoga instructor can conclude that there is no correlation between the amount of sleep and the number of calories burned during class. Therefore, the correct answer is

option 1) "There is no correlation between the amount of sleep and the number of calories burned."

Option 2) suggests that further studies would be needed to determine causation, but since there is no correlation found in this study, there is no basis for further investigation into causation.

Option 3) suggests that there is a correlation between the amount of sleep and the number of calories burned and that there is likely causation. However, this conclusion contradicts the information provided, which indicates that there is no correlation between these variables.

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The measure of the lengths of the following line segments using online ruler are given as follows:

KL = 5.11cm or  = 51.1mm

FG = 8.67cm or = 86.7mm

Length is a physical quantity that refers to the measurement of the extent of an object or distance between two points. It is usually measured in units such as meters, centimeters, or feet.

A line segment is a part of a line that is bounded by two distinct endpoints. It is the shortest distance between two points on a straight line.

To convert cm to mm, we multiply by 10 because there are 10 millimeters in 1 centimeter.

Therefore, to convert 5.11 cm to mm, we can multiply 5.11 by 10:

5.11 cm * 10 = 51.1 mm

So, 5.11 cm is equal to 51.1 mm.

Also to convert 8.67 cm to mm, we can multiply 8.67 by 10:

8.67 cm * 10 = 86.7 mm

So, 8.67 cm is equal to 86.7 mm.

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Full Question:

Although part of your question is missing, you might be referring to this full question: See attached image.

If there is a 5% chance that none of the items on a scratch-off lottery ticket will be a winner, the probability that at least one of the scratch-off items will win is 95%.

If there is a 5% chance that none of the items on a scratch-off lottery ticket will be a winner, then the probability of winning on any one item is 1 - 0.05 = 0.95 (i.e., a 95% chance of winning on any one item).

The complement rule, which states that the probability of an event occurring is equal to 1 minus the probability of the event not occurring, can be used to determine the likelihood that at least one of the scratch-off items will win. In this case, the event we are interested in is winning on at least one item. The complement of this event is not winning on any item.

So, the probability of winning on at least one item is:

1 - 0.05 = 0.95

Therefore, there is a 95% chance that at least one of the items on a scratch-off lottery ticket will win.

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Tom is working two jobs to save money for prom, walking a neighbor's dog for $6.50 an hour and washing cars for $7 an hour, to make at least $91.

Tom is working to put money aside for the prom.. His mother has instructed him that in order to keep up with his schoolwork, he may only work a maximum of 15 hours each week. Tom has made the decision to wash cars for $7 per hour and walk his neighbor's dog for $6.50 per hour in order to achieve this aim. For his prom expenditures, he will need to earn at least $91. He must put in a maximum of 13.2 hours of work to earn $91. This implies he can stroll a dog for 8.4 hours and wash vehicles for 4.8 hours. He can also decide to simply perform one job; but, in order to earn the appropriate amount, he would need to walk his neighbor's dog for 12 hours.

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The equivalent expression is; 4a^3b(4b - 2a^2b^4 + 3a)

Two expressions are equivalent when you can manipulate one expression algebraically to transform it into the other expression. For example, you can use the distributive property, combine like terms, factor out common factors, or simplify fractions to show that two expressions are equivalent.

We have the expression;

16a^3b^2 - 8a^5b^5 + 12a^4b

4a^3b(4b - 2a^2b^4 + 3a)

It's important to note that sometimes two expressions may look different, but they can be equivalent under certain conditions or constraints.

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The graph of quadrilateral ABCD is attached below and it's area is 25.5 squared units

To graph the vertices of the quadrilateral ABCD, we need to use a graphing calculator to find the sides and then the area can be calculated as;

We can use the Shoelace Formula to find the area of the quadrilateral. The Shoelace Formula is based on the idea of using the coordinates of the vertices of the polygon to calculate its area.

The formula is:

Area = 1/2 * |(x1y2 + x2y3 + ... + xny1) - (y1x2 + y2x3 + ... + ynx1)|

where (x1,y1), (x2,y2), ..., (xn,yn) are the coordinates of the vertices of the polygon in order, either clockwise or counterclockwise.

Using this formula, we get:

Area = 1/2 * |(13 + 2(-3) + 01 + (-3)4) - (42 + 30 + (-3)(-3) + 11)|

Area = 1/2 * |(-3 - 6 - 12 - 12) - (8 + 0 + 9 + 1)|

Area = 1/2 * |-33 - 18|

Area = 1/2 * 51

Area = 25.5

Therefore, the area of quadrilateral ABCD is 25.5 square units.

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Answer:

9999

Step-by-step explanation:

99x10=990

99x1=99

9999

Answer:9999

I hope it is helpful:)

Step-by-step explanation:

we can see 99 is 100-1 and 101 is 100+1

we can rewrite this as,

99*101=(100-1)(100+1)

let's use short mltiplication formula,

[tex]a^{2}-b^{2}=(a-b)(a+b)\\(100-1)(100+1)=100^{2}-1^{2}=10000-1=9999[/tex]

The density of the wax is 1.8 g/ cm ³. this means that for every cubical centimeter of the wax, it has a mass of 1.8 grams.

The density of a material is defined as its mass in line with unit volume, generally expressed in grams in line with cubical centimeter( g/ cm ³). To compute the density of the presented wax, we need to divide its mass by applying its volume.

Presented that the volume of the wax is2.5 cm ³ and its mass is 4.5 g, we will compute its density as

Density = Mass/ volume = 4.5 g/2.5 cm ³ = 1.8 g/ cm ³

Thus, the density of the wax is 1.8 g/ cm ³. this means that for every cubical centimeter of the wax, it has a mass of 1.8 grams. knowing the density of a fabric can help in relating the cloth or in predicting its deportment in distinct qualifications.

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Answer:

14490 meters

Step-by-step explanation:

0.69 x 3weeks which is (21) days , so 0.69•21 =14.490km 14.490km=14490 meters

Answer: The outliers are 54 and 100.  

Step-by-step explanation:

And outlier is a number that doesnt belong. Learn more about outliers here https://www.itl.nist.gov/div898/handbook/prc/section1/prc16.htm#:~:text=An%20outlier%20is%20an%20observation,what%20will%20be%20considered%20abnormal.

(If you were also asking about the q1, medians, and q3 please make that a seperate question.