# Question: Using the data from Table 3 9 4 for the portfolio investments

Using the data from Table 3.9.4 for the portfolio investments of CREF in aerospace and defense:

a. Find the standard deviation of portfolio value for these firms’ stock in CREF’s portfolio.

b. Find the range of these portfolio values.

c. Find the coefficient of variation.

d. Interpret the variability based on these three summaries.

e. How many portfolio values are within one standard deviation of the average? How does this compare to what you would expect for a normal distribution?

f. How many portfolio values are within two standard deviations of the average? How does this compare to what you would expect for a normal distribution?

a. Find the standard deviation of portfolio value for these firms’ stock in CREF’s portfolio.

b. Find the range of these portfolio values.

c. Find the coefficient of variation.

d. Interpret the variability based on these three summaries.

e. How many portfolio values are within one standard deviation of the average? How does this compare to what you would expect for a normal distribution?

f. How many portfolio values are within two standard deviations of the average? How does this compare to what you would expect for a normal distribution?

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