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Five balls numbered 1, 2, 3, 4, and 5 are placed in a box. One is selected, its number is noted, and then it is

Five balls numbered 1, 2, 3, 4, and 5 are placed in a box. One is selected, its number is noted, and then it is replaced. If the experiment is repeated many times, find the following:

Mean
Variance
Standard Deviation

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