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The number of suits sold per day at a retail store is shown inthe table, with the corresponding probabilities. Find themean, variance, and standard deviation of the distribution.

Numer of suits
soldX 19 20 21 22 23
Probability 0.2 0.2 0.3 0.2 0.1

If the manager of the retail store wants to be sure that hehas enough suits for the next 5 days, how many should the manager purchase?

 

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