182 Answered Questions for the topic Standard Deviation

05/12/20

what is the z score?
the number of hits a particular website receives in a day is normally distributed with a mean of 6250 hits and a standard deviation of 480 hits. what is the Z score for a day in which the website... more
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Standard Deviation Statistics Probability Mean

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
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Standard Deviation Statistics Mean

05/12/20

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
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03/29/20

What is the standard deviation of potential winnings in a casino session where a player makes 5957 bets on the number 17 for a total of 2,116,780$ and turned a net profit of $67,520?
I am trying to figure out what the standard deviation with regards to winnings in $$$ is, for the following Roulette session:The house edge in roulette is 5.26%, meaning we expect a player to lose... more
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Standard Deviation Probability Mean Distribution

03/22/20

Probability & Distribution question

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

02/12/20

Standard Deviation
Approximately what percent of a standard normal distribution is found within each region? Hint: Drawing a graph may help.Note: Please enter your answers in percentages.a.  Between the mean and one... more
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Standard Deviation Statistics

10/04/19

What percent of scores would be above 592?
The national average for mathematics on a standardized test in 2011 was 502. Suppose that the distribution of scores was approximately bell shaped and that the standard deviation was approximately... more
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08/02/19

percentage of population and probability of coin toss

hello there,I would to help me how to solve these two problems. 1- Assume the world human population heights follow a perfect normal distribution with standard deviation of 20 and mean of 150, what... more
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Standard Deviation Statistics

07/25/19

Statistics question
A sample of n = 36 scores has a mean of M = 85 and a standard deviation of s = 24. What is the estimated standard error of the t-distribution of sample means (i.e., of the t-test for a single sample)? more
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Standard Deviation Math Statistic Data Managment

07/19/19

Mr. Johnson's class is normally distributed with a class average of 75% and a standard deviation of 6. What are the quartiles of Mr. Johnson's class?
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Standard Deviation Statistics Data Managment

07/19/19

Given the mean score on the test is 300 and the standard deviation is 30. What value on the test must a person score to be in the top 10%?
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Standard Deviation Statistics Distributions

07/10/19

The scores are adjusted so that the mean score is about mu =75 and the standard deviation sigma =5. What percent of the scores fall between 65 and 75?
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Standard Deviation Math Statistics Probability

06/27/19

Farming Watermelon Statistics Question

What price do farmers get for their watermelon crops? In the third week of July, a random sample of 42 farming regions gave a sample mean of x = $6.88 per 100 pounds of watermelon. Assume that σ is... more
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Standard Deviation Statistics Percentage Median

06/25/19

Mean and Percentage
5 million students appeared in an exam.The total marks of the exam were 9.0.Mean score of male candidates: 5.55/9.0Mean score of female candidates: 5.66/9.0How many students or what percentage of... more
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06/15/19

Normal Distribution Question
Assume that x has a normal distribution with the specified mean and standard deviation. Find the indicated probability. (Round your answer to four decimal places.)μ = 4; σ = 2P(3 ≤ x ≤ 7) 
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Standard Deviation Math Equation 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.
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Standard Deviation Statistics

05/20/19

STA 2023 Standard Deviation
Please help! I am so lost!1425      1125      1128      5433      2242      2283 135        1172      1337      1802      2446      1507 2308      3838      2480      1526      2449      2170... more
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Standard Deviation Statistics

04/11/19

We have a mean of 126 and standard deviation of 18. Use the 68-95-99.7 rule to determine the percent of scores in the data set expected to be between the scores 72 and 144. Give your answer in decimal
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Standard Deviation Statistics Mean

04/08/19

Find the mean and standard deviation for the number of orange candies in such groups of 150.

Find the mean and standard deviation for the number of orange candies in such groups of 150.A random sample of 150 candies contains 44 orange candies. Is this result of unusual? Does it... more
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Standard Deviation Statistics

03/24/19

When Finding standard Deviation do you use numbers in the data set that are zero?
I am doing a data report on a survey done on the number of hours students work per month. Some students do not work so their number was 0. I am finding the standard deviation for the data set and I... more
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Standard Deviation Normal Distribution

02/24/19

How can I find two standard deviations above the mean, and one standard deviation bellow the mean
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Standard Deviation Statistics Confidence Interval

12/08/18

A random sample of 36 drivers used on average 749 gallons of gasoline per year. If the standard deviation of the population is 332, find the 95% confidence interval of the mean for all drivers.
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Standard Deviation

09/25/18

500 with a standard deviation of 150, on which exam did Carlita perform better?
Carlita scored a 32 on her math ACT and a 730 on her math SAT examinations. Given that the average math ACT score is 18 with a standard deviation of 6 and the math SAT score has an average score of... more
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09/12/18

What were the original eight measurements collected using the mean and deviations?
Students collected eight length measurements for a mathematics lab. The mean measurements was 46.3 cm. and the deviations of seven individual measurements were 0.8 cm, -0.4 cm, 1.6 cm, -1.2 cm,... more
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Standard Deviation

08/23/18

Standard deviation
If the common salary is 37,000 with a standard deviation of 4,000 would asalary of 32,500 be reasonabler
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