An examination was given to 50 students of a college A and to 60 students at College B. At A, the mean grade was 75 with a standard deviation of 9. At B, the mean grade was 79 with a standard deviation of 7. Is there a significant difference between the performance of

Q: Assume that among the members of a men's gym, the distribution of body weights has a mean of 188…

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Q: Kathy and her brother Clay recently ran in a local marathon. The distribution of finishing time for…

A: Standardized z-score:   The standardized z-score represents the number of standard deviations the…

Q: The class mean for the exam was 82 with a standard deviation of 6.  There are 37 students in the…

A: We have given that, Mean = 82 , standard deviation σ = 6  sample size n = 37   Standard error of the…

Q: Find the standard deviation of the observations 5, 11, 18, 25 and 41, using mutual differences…

A: Given: data data values  Xi: 5,11,18,25,41  Then to find standard deviations using mutual difference…

Q: The mean of a set of data is 108.06 and its standard deviation is 115.45 What is the z score for a…

A: Z-score = 3.3045 answer.

Q: If on an average 8 ships out of 10 arrive safely at a port, find the mean and standard deviation of…

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Q: Annabelle earned a score of 410 on Exam A that had a mean of 450 and a standard deviation of 40. She…

A: Here we need to find the score for exam B such that it is equivalent to the score of exam A. Inorder…

Q: The cholesterol levels of a group of young women at a university are normally distributed, with a…

A: Given μ=190σ=37 Let X: Random variable for the cholesterol level of young women Then X~N(190,372)

Q: Suppose the exam average in a class is 48% with a standard deviation of 15. What proportion of…

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Q: The scores on a standardized test are normally distributed with a mean of 85 and standard deviation…

A: If X be the scores. It is known- X~N85, 202 where, m: mean = 85 s: standard deviation = 20

Q: The temperature recorded at 60 airports in a region had a mean of 67 degrees Fahrenheit and a…

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Q: A study was conducted on shoe sizes of students, reported in European sizes. For the men, the mean…

A: Answer:- Given, In European sizes , the mean size = 43.96  standard deviation = 2.24  Also given…

Q: Assume that a data for pulse rates of 50 participants is ollected. The mean pulse rate has the mean…

A: Range rule of thumb: The values are significant if it is lies within 2 standard deviations away from…

Q: z-scores. Comparing z-scores, which test did she do better on

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Q: Sean’s exam score was 1.93 standard deviations below the mean. If the exam has a mean of 72 and a…

A: The provided information are: Population mean (µ) = 72 Population standard deviation (σ) = 5 Sean’s…

Q: Jason's z- score in the 10-k run was -3. if the raw score standard deviation was 5, and the mean…

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Q: survey reported that in a recent year, the mean serum cholesterol level in milligrams per deciliter…

A: μ = 204σ = 37n = 116Find 33rd percentile for x¯

Q: Suppose the midterm exam score for 100 students at UPC had a mean of 70 and a standard deviation of…

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Q: On standard IQ​ tests, the mean is 120 and the standard deviation is 16. The results are very close…

A: Given:-   Normal distributionmeanμ =120standard deviationσ=16we have to find PX>120