![]() Knowing the mean and standard deviation of a normal distribution, we can calculate the values that lie within 1 standard deviation of the mean.įor example, if the mean of a normal distribution is 25 years (age) and the standard distribution is 8 years, then: 99.7% of scores are within 3 standard deviations of the mean.95% of scores are within 2 standard deviations of the mean. ![]()
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