(b) A company's raw data sample of weekly salaries (in dollars) is shown below. 210 370 530 370 740 530 370 530 210 370 1140 210 A frequency distribution of this data set, based on a single-value grouping, is presented below with a third column showing the of- values-the class midpoint (which here is the same as the class) times the class frequency. Salary(x) Frequency(f) | Salary* Frequency(RF) 210 630 370 1480 530 1590 740 740 1140 1140 (). Use the row data to obtain the sample standard deviation of the ungrouped date. Round your answer to two decimal places. (6 points) Soln 268.4498 (in). Use the grouped-data formula to obtain the sample standard deviation of the grouped data in the frequency distribution. Round your answer to two decimal places, (6 points)