Point c(3.6, -0.4) divides in the ratio 3 : 2. if the coordinates of a are (-6, 5), the coordinates of point b are .
a (5,-4)
b (5,-2)
c (10,-4)
d (10,-2)

if point d divides in the ratio 4 : 5, the coordinates of point d are .
a (62/9,-4)
b (58/9,-4)
c (62/9,-2)

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.