88 Most powerful women in America. Refer to Exercise 60 and Fortune’s list of the 50 most powerful women in America.

The data are stored in the WPOWER50 file.

a. Find the range of the ages of these 50 women.

b. Find the variance of the ages of these 50 women.

c. Find the standard deviation of the ages for these 50 women.

d. Suppose the standard deviation of the ages of the most powerful women in Europe is 10 years. For which location, the United States or Europe, is the age data more variable?

e. If the largest age in the data set is omitted, would the standard deviation increase or decrease? Verify your answer.