Assume that a set of test scores is normally distributed with a mean of 100 and...
Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 25. Use the 68-95-99.7 rule to find the following quantities.
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Mean = 100
Stdev = 25
68%-95%-99.7% values are 1, 2 and 3 deviations away from mean
Therefore,
1 deviation more than mean is 100+25 = 125
2 deviations more than mean is 100+2*25 = 150
3 deviations more than mean is 100+3*25 = 175
1 deviation less than mean is 100-25 = 75
2 deviations less than mean is 100-2*25 = 50
3 deviations less than mean is 100-3*25 = 25
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