'The following scores represent the final examination grades for an elementary statistics course: 23 60 79 32 57 74 52 70 82 36 80 77 81 95 41 65 92 85 55 76 52 10 64 75 78 25 80 98 81 67 41 71 83 54 64 72 88 62 74 43 60 78 89 76 84 48 84 90 15 79 34 67 17 82 69 74 63 80 85 61 (a) Construct a relative frequency histogram; draw an estimate of the graph of the distribution, and discuss the skewness of the distribution. (b) Compute the sample mean, sample median, and sample standard deviation'