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) below. Assume the population is normally distributed. (a) Find the sample mean. X= (Round to one decimal place as needed.) 4450.09 4455.44 4283.58 3946.89 4596.01 4151.23 4527.47 4023.68 4366.54 3727.78 4407.93 4221.75

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A: Step 1: