In a company with 20 employees there are 7 earning 10hour 3

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In a company with 20 employees, there are 7 earning $10/hour, 3 earning $12/hour, 4 earning $15/hour, 2 earning $20/hour, and 4 earning $24/hour. One person from the company is selected at random.

a. What is the expected value of the person's salary?

b. What is the variance?

c. What is the standard deviation?

Reference no: EM13473134

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