The demand for Jery LLC products is related to the state of the economy. If the economy is expanding next year, the company expects sales to be $8 million. If next year is normal, sales are expected to be $6 million. If there is a recession next year, sales are expected to be $3 million. Jery LLC's economists have estimated the chances that the economy will be either expanding, normal, or in a recession next year at 0.3, 0.4, and 0.3, respectively.

a. Compute expected annual sales.

b. Compute the standard deviation of annual sales.

Please explain.