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.) 4450.64 4596.52 4366.86 4455.32 4151.19 3727.87 4283.09. 4527.93 4407.71 3946.83 4023.66 4221.91

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