Select the correct answer.
which statement is correct with respect to f(x) = -3|x − 1| + 12?

a.
the v-shaped graph opens upward, and its vertex lies at (-3, 1).

b.
the v-shaped graph opens downward, and its vertex lies at (-1, 3).

c.
the v-shaped graph opens upward, and its vertex lies at (1, -12).

d.
the v-shaped graph opens downward, and its vertex lies at (1, 12).

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.