Sampson Corp. is evaluating the introduction of a new product. The possible levels of unit sales and the probabilities of their occurrence are shown next: Possible Market Reaction Low response Moderate response High response Very high response Sales in Units 60 70 100 1.30 Probabilities 0.10 0.30 0.50 8.10 a. What is the expected value of unit sales for the new product? (Do not round intermediate calculations and round your answer to the nearest whole unit.) Expected value 90 units b. What is the standard deviation of unit sales? (Do not round Intermediate calculations. Round your answer to 2 decimal places.) Standard deviation