Which expressions are equivalent to \dfrac{1}{5}\cdot \dfrac{1}{5}\cdot \dfrac{1}{5}\cdot \dfrac{1}{5} 5 1 ⋅ 5 1 ⋅ 5 1 ⋅ 5 1 start fraction, 1, divided by, 5, end fraction, dot, start fraction, 1, divided by, 5, end fraction, dot, start fraction, 1, divided by, 5, end fraction, dot, start fraction, 1, divided by, 5, end fraction

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.