79 Answered Questions for the topic Mean

07/15/19

#### Statistics question

For a population with a standard deviation of σ = 4, what is the z-score corresponding to a score that is 6 points below the mean?

05/28/19

#### Math Question on scores

The scores on a test are normally distributed with a mean of 150 and a standard deviation of 30. Find the score that is 1 and one half standard deviations above the mean.

05/23/19

#### I can't seem to work these problems...

The following numbers describe the length of time 50 students took to complete a particular exam. Minimum = 34 minutesMedian = 52 minutesMean = 61 minutesMaximum = 125 minutes Semara took 52...
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05/16/19

#### Please answer this

Gary and Susan surveyed 10 people to find out how many board games they played in a month.Gary and Susan surveyed 10 people to find out how many board games they played in a month. The results are;...
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05/15/19

#### Gary and Susan surveyed 10 people to find out how many board games they played in a month.

Gary and Susan surveyed 10 people to find out how many board games they played in a month. The results are; Mean: 3.5, Median: 4, Range: 10. Gary then surveyed 2 additional people, with one person...
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05/06/19

#### Math proportions

Jennifer is a caterer. She has her mother's recipe for baking a cake. The recipe calls for 1/3 cup of sugar and 1/2 a cup of butter. She wants to make more servings of the cake for a catering...
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05/06/19

#### Math Proportions

Jennifer is a caterer. She has a recipe for cake that calls for a 1/2 cup of butter and 1/3 cup of flour. This cake is only meant to feed a small family. She wants to make enough cake to...
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03/18/19

#### Let f(x) = k(9x − x^2) if 0 ≤ x ≤ 9

Let f(x) = k(9x − x2) if 0 ≤ x ≤ 9 and f(x) = 0 if x < 0 or x > 9.(a) For what value of k is f a probability density function? k= ?(b) For that value of k, find P(X > 1). P(X > 1) =...
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02/01/19

#### A dataset {-2, 5, -4, x, y, 2x} has a mean of 3 and a mode of -2. Find possible x + y.

Struggling really hard to get an answer. I kept getting 5. The possible choices were -6, -2, 2, 8, 10.

09/30/18

#### The mean of four numbers is 17. When the smallest of the numbers is removed, the mean of the remaining three numbers is 19. What number was removed?

Mathletes Problem #3 - 2minutes

08/23/18

#### The mean of two numbers is 10, and one number is 6 more than the other. What is the value of the smaller of the two numbers?

Could anyone please help me?

08/08/18

#### Practice question

Suppose medical records indicate that the length of newborn babies (in inches) is normally distributed with a mean of 20 and a standard deviation of 2.6. Find the probability that a given infant is...
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04/12/18

#### How many did Ellen win?

Ellen and Janet together won 32 tennis games. Janet won 6 more than Ellen.

02/05/18

#### 30 students - the mean is 70%, 20 boys - the mean is 62%, 10 girls the mean is ?

Can you show me calculation / formula

11/10/17

#### seven numbers have a mean of 8. six of the numbers are 9,7,6,4,11 and 10. find the seventh number.

finding the missing number in a sequence of numbers that have a mean of a certain number.

09/07/17

#### A snowboarder descends a 1200-foot hill in 3 minutes. What is the mean change in elevation per minute?

Please help! I'm very confused. Thanks!

06/14/17

#### Standard deviation

Find the mean for a set of data with a standard deviation of 1.3, given that a value if 95 has a z score of 0.5

05/25/17

#### What would the mean be?

Person A has a z-score of -3 and is on her phone for 7 hours a day. Person B has a z-score of -4 and is on her phone for 3 hours a day. It is a normal distribution. What would be the mean of the...
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05/22/17

#### create a data set that has five. The mean should be 12

Create a data set that has five values. The mean should be 12

05/03/17

#### the mean number of wins for the last 20 seasons is 10.4. In the 21st season, the team won 14 games. What will be the new mean? Show all of your work.

Explain why you did each step

03/02/17

#### The sum of four numbers is 396.80. The first two numbers are 96.8 and 100.1. Find the average of the four numbers

word problem I need to solve for homework. I need to know how to get the answer

02/04/17

#### STATS QUESTION

In a neighborhood near Simmons, there are 280 families. The average number of members per family is 3.5. How many people live in the neighborhood?a. 980 peopleb. 80 peoplec. 900 peopled. 105 people

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