Which of the following is true about the median of a trapezoid? a. the median connects the midpoints of the bases of a trapezoid. b. the median connects the endpoints of the bases of a trapezoid. c. the length of the median is half the sum of the lengths of the bases. d. the length of the median is half the difference of the lengths of the bases.

3.17 scores on stats final. below are final exam scores of 20 introductory statistics students. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 57, 66, 69, 71, 72, 73, 74, 77, 78, 78, 79, 79, 81, 81, 82, 83, 83, 88, 89, 94 (a) the mean score is 77.7 points. with a standard deviation of 8.44 points. use this information to determine if the scores approximately follow the 68-95-99.7% rule. (b) do these data appear to follow a normal distribution? explain your reasoning using the graphs provided below.