Amy Wants to Estimate the Average Number of Items Per

Essay

Amy wants to estimate the average number of items per purchase at the express lane of a local grocery store. She has estimated the following probabilities based on a sample size of 50 customers. Determine the expected value, variance, and standard deviation of items per purchase. $$\begin{array} { | l | l | } \hline \text { Items per Purchase } & \text { Probability } \\\hline 1 & 0.29 \\\hline 2 & 0.16 \\\hline 3 & 0.15 \\\hline 4 & 0.18 \\\hline 5 & 0.22 \\\hline\end{array}$$