Referring to Exercise 43, the annual report of Dennis Industries also gave these returns on stockholder equity

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Referring to Exercise 43, the annual report of Dennis Industries also gave these returns on stockholder equity for the same 5-year period (in percent): 13.2, 5.0, 10.2, 17.5, and 12.9.
a. What is the arithmetic mean return?
b. What is the variance?

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