2.32 A sample of 20 financial analysts was asked to provide forecasts of earnings per share of a corporation for next year. The results are summarized in the following table:

Forecast ($ per share) Number of Analysts

$9.95 to under $10.45 2

$10.45 to under $10.95 8

$10.95 to under $11.45 6

$11.45 to under $11.95 3

$11.95 to under $12.45 1

a. Estimate the sample mean forecast.

b. Estimate the sample standard deviation.