(Answered) I have 100 units of a product in stock the demand d for the

Statistics

I have 100 units of a product in stock. The demand D for the item is a continuous random variable with the following density function:

If {1/40 if 80<=d<=120

{0 otherwise

a Find the probbility that supply is insufficient to meet demand.

b What is the expected number of items sold? What is the variance of the number of items sold?

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