Mathematics, 29.02.2020 04:13, TH3L0N3W0LF
Suppose in a large class, students' grade in a test followed the normal distribution. Approximatley what percent of grades is between two standeard deviation below the mean and two standar deviation above the mean (that is in between Xbar-2S and Xbar+2S grades)? note, Xbar is the mean and S is standard deviation.
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