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	Sales in Units			Probabilities
Low response		70			0.20
Moderate response		80			0.20
High response		90			0.30
Very high response		110			0.30

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.)

b. What is the standard deviation of unit sales? (Do not round intermediate calculations. Round your answer to 2 decimal places.)