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what is the mean and variance of the number of pizzas delivered to students each month with the following distribution: 0 customers with .1 probability,

what is the mean and variance of the number of pizzas delivered to students each month with the following distribution: 0 customers with .1 probability, 1 customer with .2 probability, 2 customers with .25 probability, 3 customers with .25 probability, and 4 customers with .2 probability?

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