Using the data from Table 3.9.4 in Chapter 3, for the portfolio investments of College Retirement Equities Fund in aerospace and defense:
a. Find the average market value for each firm’s stock in CREF’s portfolio.
b. Find the median of these market values.
c. Compare the average to the median.
d. Find the five-number summary.
e. Draw a box plot, and comment on the distribution shape. In particular, are there any signs of skewness?
f. Is the relationship between the average and median consistent with the distribution shape? Why or why not?