1. In a mid-size company, the distribution of the number of phone calls answered each day by each of the 12 receptionists is not bell-shaped and has a mean of 61 and a standard deviation of 9. Using Chebyshev's Rule, at least what percentage of daily phone calls number between 25 and 97?

Percentage is

19. Running times in a daily workout have a mean of 35 minutes and a standard deviation of 7 minutes. The distribution is unknown. Using Chebyshev's Rule, in what interval about the mean would you expect to find at least 89% of the workout times?

22.A data set of tire pressures(psi) has a mean of 9 and a standard deviation of 2.219, calculate the z-score of 8.385337.

z-score =

36.Pro golf scores are bell-shaped with a mean of 71 strokes and a standard deviation of 5 strokes. Using the empirical rule, in what interval about the mean would you expect to find 99.7% of the scores?

Interval is - AND -