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160 Answered Questions for the topic Standard Deviation

Standard Deviation Math Statistics

9d

Data Management Probability, Standard Deviation, and Normal Distribution Question:

Hi, how would i get started on solving this question? The average monthly rainfall in Southern California is 26 mm. If rainfall data over the year is normally distributed with a standard deviation... more
Standard Deviation 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
Standard Deviation Statistics Psychology

06/30/20

STATS IN PSYCHOLOGY

Assume your class took a final exam in psychology in which the scores produced a normal curve with a mean score of 80 and a standard deviation of 5. If the student scores within two standard... more
Standard Deviation Math Statistics

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
Standard Deviation Math Statistics

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
Standard Deviation Math Statistics

06/12/20

probability in statistics

The number of hours an American adult sleeps each night follows a Normal distribution with an average of 6.9 hours per night with a standard deviation of 0.68 hours. If we randomly select one... more
Standard Deviation Math Statistics

06/12/20

Probability in statistics and standard deviation

The number of hours an American adult sleeps each night follows a Normal distribution with an average of 6.9 hours per night with a standard deviation of 0.68 hours. If we take a random sample of... more
Standard Deviation Math Statistics

05/21/20

Math Problem with Standard deviation and Expected Time

A survey was done on a group of people that asked the time, , it takes them to commute to work, rounded to the nearest 10 minutes. Use the probability distribution table below to answer Part 1-2.X... more
Standard Deviation Statistics Normal Distribution

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
Standard Deviation Statistics Probability

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
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

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
Standard Deviation Probability Mean

03/22/20

Probability & Distribution question

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

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
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
Standard Deviation Math Statistics

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
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
Standard Deviation Statistics Probability

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) 
Standard Deviation 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.
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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