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The numbers of courses taught per semester by a random sample of university professors are shown in the histogram. Make a frequency distribution for the data. Then use the table to estimate the sample mean and the 25 sample standard deviation of the data set. 23 20 20 18 Number of professors Make a frequency distribution for the data. X 2\fThe sample mean is x= (Round to one decimal place as needed.) The sample standard deviation is s = 1 Round to one decimal place as needed.)