The Airline Industry Defines No- Shows as Passengers Who Have

Multiple Choice

The airline industry defines no- shows as passengers who have purchased a ticket but fail to arrive at the gate on time for departure. Southwest Airlines operates many flights from Philadelphia to Dallas and experienced the following no- show probability distribution last year.
$$\begin{array} { l | l | l | l | l | l | l | l } \text { No-shows } & 0 & 1 & 2 & 3 & 4 & 5 & 6 \\\hline \text { Probability } & 6 \% & 12 \% & 22 \% & 28 \% & 17 \% & 11 \% & 4 \%\end{array}$$
The following data represent the number of no-show has changed between last year on flights between these cities using ?=0.05. The degrees of freedom for the critical value is _____

A) 4
B) 6
C) 5
D) 3