Probability Problems including Continous Random Variables
I have 100 items of a product in stock. The probability mass function for the product’s demand D is P(D=90)=P(D=100)=P(D=110)=1/3
a) find the mass function, mean and variance of the number of items sold.
b) find the mass function, mean, and variance of the amount of demand that will be unfilled because of the lack of stock.