A national real estate company just acquired a smaller firm with offices and agents in Los Angeles and other parts of Southern California. The national firm conducted a sample survey to learn about attitudes and other characteristics of its new employees. In a sample of eight offices, all of the agents completed the questionnaire. Results of the survey for the eight offices follow. Office Agents Average Age College Graduates Male Agents
1 17 37 3 4
2 35 32 14 12
3 26 36 8 7
4 66 30 38 28
5 43 41 18 12
6 12 52 2 6
7 48 35 20 17
8 57 44 25 26

Required:
a. Estimate the mean age of the agents.

b. Estimate the proportion of agents who are college graduates and the proportion who are male.
c. Develop an approximate 95% confidence interval for the mean age of the agents.
d. Develop an approximate 95% confidence interval for the proportion of agents who are college graduates.
e. Develop an approximate 95% confidence interval for the proportion of agents who are male.