Question: 3. A data entry clerk studied the number of errors found on expense forms. The data are summarized in the following table: Errors Found Percentage

3. A data entry clerk studied the number of errors found on expense forms. The data are summarized in the following table: Errors Found Percentage 1 20 2 50 3 20 4 10

a. What is the mean number of errors found?

b. What is the variance of the number of errors found?

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