expectaton, Advanced Statistics

Assignment Help:
sales per day for a product are as follows: x= 10, 11, 12, 13
(p)= 0.2, 0.4, 0.3, 0.1
obtain mean and variance of daily sale.
if the profit is described by the following equation profit=-15+4.5X
what is expected daily profit? what is the variance of daily profit ?

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