The monthly incomes for 12 randomly selected people, each with a 4450.53 4596.62 4366.28 bachelor's degree in economics, are shown on the right. Complete parts 4455 11 4151.87 3727.38 (a) through (c) below. 4283.72 4527.37 4407 27 Assume the population is normally distributed 3946.71 4023.66 4221.97 (b) Find the sample standard deviation (Round to one decimal place as needed )