What Is the Expected Number of Phone Calls Per Hour

question 37

Essay

What is the expected number of phone calls per hour based on the following distribution on the number of phone calls per hour?
$\begin{array}{ccccc} & \mathrm{~A} & \mathrm{~B} & \mathrm{C} & \mathrm{D} \\1 & \text { \# of phone calls } & \mathrm{P}(\# \text { of phone calls) } & \text { \# of phone calls } & \mathrm{P}(\# \text { of phone calls) } \\2 & 1 & 0.10 & 1 & 0.10 \\2&2& 0.40 & 2 & 0.50 \\4 & 3 & 0.30 & 3 & 0.80 \\5 & 4 & 0.15 & 4 & 0.95 \\6&5 & 0.05 & 5 & 1.00\end{array}$