A bowl contains 10 chips, of which 8 are marked $2 each and 2 are marked $5 each. Let a person choose, at random and with replacement, three chips from this bowl. If the person receive the sum of the resulting amounts, find his expectation and standard deviation of the amount he received. What is the probability the amount he will receive is within (+-) 1 standard deviation from the mean?
E(X) = 2.6
Then I have no more idea.

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Ah 20 more mins to submission due date.

Guess I will go up to my teacher office and submit now :(.

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