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Exercise 3-42 Consider these six values of a population: 3,1, 8, 6, 6 and 3 a. Determine the mean of the population. (Round the final answer to 1 decimal place.) Arithmetic mean b. Determine the variance of the population (Round the final answer to 2 decimal places.) Variance Exercise 3-43 The annual report of Dennis Industries cited these primary earnings per common share for the past 5 years. $4.58, $3.44, $2.72, $1.17, and $1.8. a. What is the arithmetic mean primary earnings per share of common stock? (Round the final answer to 2 decimal places. Arithmetic mean b. What is the variance? (Round the final answer to 2 decimal places.) Variance