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## Homework Statement

Airlines sometimes overbook flights. Suppose that for a plane with 50 seats, 55 passengers have tickets. Define the random variable Y as the number of ticketed passengers who actually show up for the flight. The probability mass function of Y appears in the accompanying table.

[tex]\begin{tabular}{ c | c c c c c c c c c c c}

y & 45 & 46 & 47 & 48 & 49 & 50 & 51 & 52 & 53 & 54 & 55 \\

\hline

p(y) & .05 & .10 & .12 & .14 &.25 &.17 & .06 & .05 & .03 & .02 & .01 \\

\end{tabular}[/tex]

**a.) What is the probability that the flight will accommodate all ticketed passengers who show up?**

## The Attempt at a Solution

I don't know how to start this problem.