MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Joan’s finishing time for the Bolder Boulder 10K race was 1.73 standard deviations faster than the women’s average for her age group. There were 415 women who ran in her age group. Assuming a
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- The manager of a department store wants to estimate the average amount ofmoney a customer will spend in her store. She estimates from past experiencethe standard deviation is $30. How big of a sample should she take to be 95%sure her estimate is off by no more than $5?arrow_forwardOn a nationwide math test, the mean was 72 and the standard deviation was 7. If Roberto scored 90, what was his z-score?arrow_forwardWhich test was better?. Gina took a midterm in her math class and her biology class. After she gets her grades for those midterms, she wonders if she did better on the math midterm or the biology midterm. For the math test, she received 47 points where the mean was 39 and the standard deviation was 13. Calculate the z-score for the math test for Gina. Be sure to round to 2 decimal places. Answer:arrow_forward
- Three potential employees took an aptitude test. Each person took a different version of the test. The scores are reported below. Pierce got a score of 71.5; this version has a mean of 62.5 and a standard deviation of 15. Vincent got a score of 309.2; this version has a mean of 294 and a standard deviation of 19. Norma got a score of 7.96; this version has a mean of 7.2 and a standard deviation of 0.4. If the company has only one position to fill and prefers to fill it with the applicant who performed best on the aptitude test, which of applicants should be offered the job?arrow_forwardPlease solve using Rarrow_forwardA pharmacologist measured the concentration of dopamine in the brains of several rats.The mean concentration was 1,269 ng/gm and the standard deviation was 145 ng/gm.4What was the standard error of the mean if (a) 8 rats were measured? (b) 30 rats were measured?arrow_forward
- Debbie scored 71 points on her history test. The mean was 65 points and the standard deviation was 3 points. Harry scored 85 points on his architecture test. The mean was 70 points and the standard deviation was 10 points. Who scored relatively better on their test?arrow_forwardPlease solve for D,E, and Farrow_forwardAmericans (on average) individually eat 16 pounds of seafood each year with a standard deviation of 7 pounds. James samples 40 Americans and finds and average of 14 pounds. How likely is it to get an average of 14 pounds if he had a representative sample?arrow_forward
- Abby's score of 704 on the math portion of the 2002 GRE exam placed her in the 84th percentile rank. The standard deviation of this exam was 141. If the test scores are normally distributed, what was the mean score of the 2002 test takers? write your answer with one decimal place.arrow_forwardGrace has a dog and its weight is z = -0.5lbs. Her current weight is 47 lbs. The average weight for medium-sized dogs is 50 lbs. What is the standard deviation for a dog of her size?arrow_forwardplease solve : B, C, and D ch 9arrow_forward
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