3. A survey reported the number of hours spent in the gym per week for a sample of 60 adults between ages 20-25. 264524 9.3 5.3 6.3 8.8 6.5 0.6 5.2 6.6 9.3 4.3 6.3 2.1 2.7 0.4 3.7 3.3 1.1 2.7 6.7 6.5 4.3 9.7 7.7 5.2 1.7 8.5 4.2 5.5 5.1 5.6 5.4 4.8 2.1 10.1 1.3 5.6 2.4 2.4 4.7 1.7 2.0 6.7 1.1 6.7 2.2 2.6 9.8 6.4 4.9 5.2 4.5 9.3 7.9 4.6 4.3 4.5 9.2 8.5 6.0 8.1 a. Organize the data into a frequency distribution (show the relative frequency distribution and the percent frequency distribution as well). How many classes would you suggest? What value would you suggest for a class interval? (show the step-by-step calculations). b. Draw a histogram (by hand). Interpret your result. IS 601 4. The duration of computer usage (in minutes) for all the 13 computers in a company during the past week is listed below. 9, 195, 241, 301, 216, 260, 7, 244, 192, 147, 10, 295, 142 a. Is this a sample or a population? Why? b. Find the mean and median of the computer usage (show the step-by-step calculations). c. Find the range and the standard deviation of the computer usage (show the step-by- step calculations). 5. A survey of a 10 families in the United States shows the amount they spent on grocery shopping during the past week as follows: $10, $126, $103, $93, $99, $113, $87, $101, $109, $100 a. Compute the mean (show the step-by-step calculations). b. Compute the variance (show the step-by-step calculations). c. Compute the standard deviation (show the step-by-step calculations). d. Are a, b, and c an estimate or the exact value for the arithmetic mean, variance, and standard deviation of what all the families in the United States spent on grocery shopping during the past week? Why?