At an arcade, the ratio of the number of games to the cost of the games is 2 to 6. which set of ordered pairs can be used to represent the relationship between the number of games and the cost of the games? (1, 1), (3, 3), (5, 5), (7, 7) (1, 3), (3, 9), (5, 15), (7, 21) (1, 2), (3, 6), (5, 10), (7, 14) (1, 4), (3, 12), (5, 20), (7, 28)

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.