The monthly incomes for 1212 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.
4450.794450.79
4596.864596.86
4366.984366.98

4455.464455.46
4151.464151.46
3727.433727.43
4283.294283.29
4527.244527.24
4407.134407.13
3946.073946.07
4023.464023.46
4221.194221.19
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Part 1