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

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

Exemptions

Percent

1

10

2

30

3

40

4

20
  1. What is the mean number of exemptions claimed?
  2. What is the variance of the number of exemptions claimed?
  3. What is the standard deviation of the number of exemptions claimed?
math   Statistics-And-Probability   
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Answer #1

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