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			0.50
Moderate response		90			0.20
High response		110			0.10
Very high response		130			0.20

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= ________ units

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

Standard deviation= _______ units