13. The surveys of interest for a concert produced these data points about the relation between ticket price and ticket sales
Ticket Price (S)
3
5
7
9
11
13
Ticket Sales (S) 1447 1353 1212 1025 790 509
(A) Find the quadratic equation that best models the data,
14a)
(B) Predict the ticket sales if the tickets are $8 each.
14b)
(C) What would the price of the ticket have been if there
is $1000 in ticket sales?
14c)

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.