2.32 For predicting credit default, a sample of 20 financial data analysts was asked to provide forecasts of credit scores for next year. The results are summarized in the following table:

Forecast (£ 000) Number of Clients 10.95 6 11.45 5 11.45 6 12.95 18 12.95 6 13.45 16 13.45 6 14.95 23 14.95 6 15.45 11

a. Estimate the sample mean forecast.

b. Estimate the sample standard deviation.