The annual report of Dennis Industries cited these primary earnings per common share for the past 5 years: $2.48, $1.34, $2.35. $4.39, and $3.31. a. What is the arithmetic mean primary earnings per share of common stock? (Round your answer to 2 decimal places.) Arithmetic mean b. What is the variance? (Do not round intermediate calculations and round your answer to 2 decimal places.) Variance