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In a population distributed according to a normal distribution (a bell curve), what percent of the population is between the mean and one standard deviation above the mean? What percent of the population is between one and two standard deviations above the mean?
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For any large Normal Distribution, let M = mean, and D = standard deviation of the distribution. Then, in the region
M < x < M + D
one always finds 34% of the population, and in the region
M + D < x < M + 2D
one always finds 13.5% of the population. If you know those two numbers, you can compute anything else you need to know about the Normal Distribution.
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