Done MAT 121 Final Exam Practice Que…

5) In a sample of 100 adult men on a weight loss regimen, the sample mean weight loss is x = 26 pounds with a sample median of M = 12 pounds. Briefly describe the shape of the distribution of the histogram of the sample of men.

6) The relative frequency histogram below presents the average temperatures for each of the 50 states of the United States, plus the District of Columbia. Use the histogram to answer the following questions:

035- I, 0_30- N 025-g 0.20- ui 0.15- ] 0.10- 005-

35 40 45

50 5, 60 65 70 Av erns Temperature

n 75 92

a. What is the class width?

b. In which interval are the largest number of states?

c. Given that there were 51 states in this population, approximately how many of the states had average temperatures between 40-45?

7) For a population with a mean p = 32 and a standard deviation of a = 12, find the z-score of a population value of 28.

8) The mean length of one-year-old spotted flounder, in millimeters, is 126 with standard deviation of 18, and the mean length of two-year-old spotted flounder is 162 with a standard deviation of 28. The distribution of flounder lengths is approximately bell-shaped. Anna caught a one-year-old flounder that was 150 millimeters in length. Luis caught a two-year-old flounder that was 190 millimeters in length. Whose fish is longer, relative to fish the same age?

9) Find the area under the following standard normal curves: a. -0 ye b.