1) A telemarketer makes six phone calls per hour and is able to make a sale on 30% of these contacts. During the next two hours, find:

a)The probability of making exactly four sales.

b)The probability of making no sales.

c)The probability of making exactly two sales.

d)The mean number of sales in the two-hour period

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Also please answer #2 in the image below:

A data entry clerk studied the number of errors found on expense forms. The data is summarized in the table below: Errors Percentage found 1 20 2 50 3 20 4 1 0 a) What is the mean number of errors found? b) What is the variance of the number of errors found