Suppose the length of a catfish is normally distributed with a mean of 8.5 in and a standard deviation of 2 in. Which group describes 16% of the catfish population? Select each correct answer.
(Hint - there are 2 and there is a question like this one on the quiz)
(Select all that apply.)
Catfish that are shorter than 6.5in
Catfish that are between 6.5in and 8.5in
Catfish that are between 6.5in and 10.5in
Catfish that are longer than 10.5in

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.