The graph illustrates the distribution of test scores taken by College Algebra students. The maximum possible score on the test was 110, while the mean score was 72 and the standard deviation was 8. 48 56 64 72 80 88 96 Distribution of Test Scores Use the "Empirical Rule", not a calculator or other technology. Do not round your answers. What is the approximate percentage students who scored between 64 and 80 on the test? What is the approximate percentage of students who scored between 64 and 72? What is the approximate percentage of students who scored less than 56 on the test? What is the approximate percentage of students who scored between 56 and 88 on the test?

There are two major tests of readiness for college, the ACT and the SAT. ACT scores are reported on a scale from 1 to 36. The distribution of ACT scores is approximately Normal with mean = 21.5 and standard deviation = 5.4. SAT Scores are reported on a scale from 600 to 2400. The distribution of SAT scores is approximately Normal with mean = 1498 and standard deviation = 316. (b) Joshua scores 17 on the ACT. Anthony scores 1030 on the SAT. Assuming both tests measure the same thing, who has the higher score? Report both z-scores. (c) What is the purpose of finding the z-scores for both the ACT and SAT scores?

You want to know the percentage of utility companies that earned revenue less than 67 million dollars. If the mean revenue was 50 million dollars and the data has a standard deviation of 7 million, find the percentage. Assume that the distribution is normal. Round your answer to the nearest hundredth.

In some reports, the mean and coefficient of variation are given. For instance, one report gives the average number of physician visits by males per year. The average reported is 2.6, and the reported coefficient of variation is 2.3%. Use this information to determine the standard deviation of the annual number of visits to physicians made by males. (Round your answer to three decimal places.)

The graph illustrates the distribution of test scores taken by College Algebra students. The maximum possible score on the test was 130, while the mean score was 70 and the standard deviation was 13. 31 44 57 70 83 109 96 Distribution of Test Scores Use the "Empirical Rule", not a calculator or other technology. Do not round your answers. What is the approximate percentage of students who scored higher than 96 on the test? % What is the approximate percentage of students who scored between 44 and 96 on the test? What is the approximate percentage students who scored between 57 and 83 on the test? What is the approximate percentage of students who scored between 57 and 70? %