Sampson Corporation is evaluating the introduction of a new product. The possible levels of unit sales and the probabilities of their occurrence are shown next: Sampson Corporation is evaluating the introduction of a new product. The possible levels of unit sales and the probabilities of their occurrence are shown next: a$.$ What is the expected value of unit sales for the new product? Note: Do not round intermediate calculations and round your answer to the nearest whole unit.$)$ b$.$ What is the standard deviation of unit sales? Note: Do not round intermediate calculations. Round your answer to $2$ decimal places.