Astore sells t-shirts for $14 and sweatshirts for $25. they sell 200 items and earn $3,515 in sales. which equation could be used to find the number of t-shirts (t) sold? answer options with 4 options a. 14t + 25(200 − t) = 3515 b. 14 + 25(200 − t) = 3515 c. 14t + 25(200 + t) = 3515 d. 14 + 25(200 + t) = 3515

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.