Airline travelers should be ready to be more flexible as airlines once again cancel thousands of flights this summer. The Coalition for Airline Passengers Rights, Health, and Safety averages $400$ calls a day to help stranded travelers deal with airlines. Suppose the hotline is staffed for $16$ hours a day.

a$.$ Calculate the average number of calls in a one$-$hour interval; $30-$minute interval; $15-$minute interval. $($Round your answers to $2$ decimal places.$)$

Answer is complete and correct.

$\backslash$table$[[$Interval$,\backslash$table$[[$Average$],[$Number of$],[$Calls$]]],[60-$minute,$25\mathrm{.}00],[30-$minute,$12\mathrm{.}50],[15-$minute,$6\mathrm{.}25]]$

d$.$ What is the probability of at least two calls in a $15-$minute interval? $($Do not round intermediate calculations. Round your fina answer to $4$ decimal places.$)$

Answer is complete but not entirely correct.

Probability