A Newsstand Is Trying to Determine How Many Bundles of Newspapers

Essay

A newsstand is trying to determine how many bundles of newspapers to stock.For each bundle,the newsstand makes $20.However,they lose $5 per bundle if they do not sell.The following discrete probability distribution has been estimated for their daily demand.How many bundles should they stock?
$$\begin{array} { | c | c | } \hline \begin{array} { c } \text { Demand } \\\text { (bundles) }\end{array} & \text { Probability } \\\hline 4 & .10 \\5 & .20 \\6 & .30 \\7 & .30 \\8 & .10 \\\hline\end{array}$$