Family Entertainment Costs – The mean total costs for all forms of family entertainment (i.e. movies, toys, video games, plays, concerts, etc.) was $12,000 per year. Suppose that ? = $2000 and 36...

Family Entertainment Costs – The mean total costs for all forms of family entertainment (i.e. movies, toys, video games, plays, concerts, etc.) was $12,000 per year. Suppose that ? = $2000 and 36 families are randomly selected. Find the probability that the sample mean cost for these 36 families is a) Less than $11,000. b) More than $14,000. c) Between $11,000 and $14,000.