Four numbers from the set 0 to 9, including 0 and 9, are used to create a personal identification number. Once a number is used,
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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.
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Therefore, the probability
The required probability