John is doing a fundraiser for school. He needs to sell at least $200 worth of items. John is selling shirts for $10 each and ha
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The '68-95-99.7' rule says
-About 68% of values fall within one standard deviation of the mean.
-About 95% of the values fall within two standard deviations from the mean.
-Almost all of the values — about 99.7% — fall within three standard deviations from the mean.
Here
Therefore, the probability
The required probability