Chapter 8.4, Problem 44E

(a)

To determine

To calculate: The expected value, and the standard deviation of the variable X when a teenager played a computer game at least one time in a week is selected randomly with a probability $0.48$, and X is the number of teenagers in a group of $30$ random selected teenagers who will play a computer game during next $7$ days.

(b)

To determine

To fill: The blank in the statement “There is an approximately $16\%$ chance that ______ or more teenagers in the group will play a computer game during next $7$ days.”