font problems. Is that supposed to be sigma = 3.1?
If so, just figure the mean, and find the maximum difference of each grade from the mean. Then divide that by 3.1 to get the number of std.
Mrs. Jones algebra 2 class scored very well on yesterday's quiz. With one exception, everyone received an A. Within how many standard deviations from the mean do all the quiz grades fall ? Ó =3.1
95, 92,94,88,96,99,91,93,94,97,95,97
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7 answers