In triangle pqr, r2 = p2 + q2.

which equation is true about the measure of the angles of the triangle?

the measure of angle prq is equal to 100 degrees
the measure of angle prq is equal to 90 degrees
the measure of angle pqr plus the measure of angle qpr is equal to 80 degrees
the measure of angle pqr plus the measure of angle qpr is equal to 70 degrees

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.