6. The following data were collected on scores (out of a possible 100) for a pretest in quantitative methods. Using Excel's statistical functions, complete the following questions. SCORES 99 12 94 21 11 88 10 5 10 88 2 89 18 97 5 87 100 10 a. What is the mean of the data set for pretest scores? b. What is the median of the data set for the scores on the pretest? Is there a difference or similarity? Explain the similarity or difference. c. What is the standard deviation of the data set? d. Construct a histogram for the pretest score data set, using 5 as your class width and starting with 0 as your lowest class. e. Relate the standard deviation you calculated in part c to your histogram in part d