Mrs. Smith's Algebra 2 class scored very well on the last quiz. With one exception, everyone received an A. Within how many standard deviations of the mean do all the quiz grades fall? 97, 95, 97, 94, 93, 99, 91, 96, 94, 88, 92, 91 (1 point) Responses 4 4 2 2 3 3 1
The mean of the quiz scores is 94.8 and the standard deviation is 3.42. Since all the quiz grades fall within one standard deviation of the mean, all the quiz grades fall within 3 standard deviations of the mean.
Therefore, the answer is 3.