21. The following probability distributions of job satisfaction scores for a sample of information systems (IS) senior executives and IS middle managers range from a low of 1 (very dissatisfied) to a high of 5 (very satisfied).

Probability Job Satisfaction IS Senior IS Middle Score Executives Managers 1 .05 .04 2 .09 .10 3 .03 .12 4 .42 .46 5 .41 .28

a. What is the expected value of the job satisfaction score for senior executives?

b. What is the expected value of the job satisfaction score for middle managers?

c. Compute the variance of job satisfaction scores for executives and middle managers.

d. Compute the standard deviation of job satisfaction scores for both probability distributions.

e. Compare the overall job satisfaction of senior executives and middle managers.