Answer
The average cost is $5075.
Work Step by Step
From the provided data of the number of freights, the expected number of freights is computed below.
Hence, the mean number of freights is calculated as
\[\begin{align}
& E\left( x \right)=\sum{x\times p\left( x \right)} \\
& =2.5375
\end{align}\]
The fare of an adult is $\$2000$, so the mean cost is $\$5075$.
