Which of the following represents the value of the series below? (I need someone to double-check the answer I got)

S{28}=sum {k=1}^{28} (9k-4)

S{28}=3542

Answer Choices:

A: S{28}=28{5+248}/{2}

S[28}=3542

B. S{28}=(9(28)-4)+(9(1)-4)

S{28}=253

C. S{28}=28(5+248)

S{28}=7084

D. S{28}=28(248-5)/{2})

S{28}=3402

Hence, A is the answer.

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.