When the function f(x) = 4(2)x is changed to f(x) = 4(2)x − 13, what is the effect? a. there is no change to the graph because the exponential portion of the function remains the same. b. the x-intercept is 13 spaces higher. c. the y-intercept is 13 spaces lower. d. all input values are moved 13 spaces to the left.

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.