Question: a box contains 5 balls. Two are numbered 3 , one is numbered 4,and two are numbered 5. the balls are mixed and one is

a box contains 5 balls. Two are numbered 3 , one is numbered 4,and two are numbered 5. the balls are mixed and one is selected at random. after a ball is selected, its number is recorded. then it it replaced. if the experiment is repeated many times,find the variance and standard deviation of the numbers on the balls.

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