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91 Answered Questions for the topic Mean

07/06/20

Mean of Test scores

the mean of normal distributed test score is 79 and the standard deviation is 5 if there are 242 test scores in the data sample how many of them were in the 84 to 94 range

06/12/20

Statistics with confidence intervals

A random sample of 80 college students was asked, “How many hours do you study each week?” After gathering the data, the sample has a mean of 14 hours and a standard deviation of 2.8 hours.... more

06/12/20

Intro to statistics

Suppose we want to estimate the average IQ score for the population of statistics students. What is the minimum number of statistics students that must be randomly selected for IQ tests if we want... more
Mean

05/26/20

a question about median and mean

Jose is participating in a 6-day cross-country biking challenge. He biked for 48, 54, 51, 69, and 64 miles on the first five days. How many miles does he need to bike on the last day so that his... more

05/12/20

what is the likelihood a pack of gummy bears will contain between 37 and 45 candies?

the number of pieces in a pack of gummy bears is normally distributed with a mean of 35 and a standard deviation of 4. if a package is chosen at random what is the likelihood it will contain... more

what is katie's mark if she scored above the mean?

a teacher is analyzing the results for a test, the marks are normally distributed with a mean of 77.4 and a standard deviation of 4.2. determine katie's mark if she scores 2.5 standard deviations... more

Probability & Distribution question

Thank you so much!! I really want to master this unit :(

02/22/20

CRAUDQL3 6.1.022.

An auto dealer’s sales numbers are shown in the table below. Find for each month the mean, median, and mode prices of the cars she sold. Round your answers to the nearest dollar.Price. ... more

02/12/20

Generate random numbers within a range with pre-defined sum

What if I want to generate random numbers within a range with a fixed sum?? For example: I want to generate 50 numbers between 50 - 100 but with a fixed sum of 4650 so that I would produce a mean... more

02/12/20

How to generate random numbers with specific mean

Is there any formula that I can understand which will allow me to generate random numbers with a specific mean. I'm using java. Thanks

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?
Mean Math Equation

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... more

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;... more

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... more

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... more

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... more

Confidence interval

study of the ages of motorcyclists killed in crashes involves the random selection of 139 drivers with a mean of 35.31 years. Assuming that σ=10.1 ​years, construct and interpret a 99​% ... more

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) =... more

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.

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... more
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