6) Below is a stem and leaf plot of scores for an exam |10|0 94 81 7 9710 6 98855421 5 866551000 4 99986554322| 3 9955331 a. Find the mean and standard deviation of the scores (Hint: the sum of the 42 scores is 2322 and the sum of squares of the scores is 139032). b. Calculate the intervals s, 2s, and 3s and determine the proportion of observations rule? that fall within each interval. Does the sample seem to obey the empirical c. Find the z-score of the person who got 100 on the exam.