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Scores within one and two standard deviations

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Using a standard normal distribution, what percent of scores fall within one standard deviation of the mean? What percent of scores fall two or more standard deviations below the mean? If the mean = 250, what is the median?

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This solution explains the percent of scores that fall within both 1 and 2 standard deviations from the mean.

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If you have a standard normal distribution, then 68% of the scores fall within one ...

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