The monthly incomes for 12 randomly selected people, each with a bachelor's degree in economics, are shown on the right. Complete parts (a) through (c) 4450.12 below. 4596.25 4366.83 4455.62 4151.25...

Extracted text: The monthly incomes for 12 randomly selected people, each with a bachelor's degree in economics, are shown on the right. Complete parts (a) through (c) 4450.12 below. 4596.25 4366.83 4455.62 4151.25 3727.87 4283.43 4527.65 4407.44 Assume the population is normally distributed. 3946.89 4023.89 4221.03 (a) Find the sample mean. x = (Round to one decimal place as needed.)