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Please show all work and don't use excel functions to solve. 1. A CPA studied the number of exemptions claimed on tax returns. The data

Please show all work and don't use excel functions to solve.

1. A CPA studied the number of exemptions claimed on tax returns. The data are summarized as follows:

Exemptions Percent

1 10

2 20

3 50

4 20

a. What is the mean number of exemptions claimed?

b. What is the variance of the number of exemptions claimed?

c. What is the standard deviation of the number of exemptions claimed?

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