-- Measure the length of the box.
-- Measure the width of the box.
-- Measure the height of the box.
-- Make sure all 3 measurements are in the same units.
-- Multiply (length) x (width).
-- Take that answer and multiply it by (height).
-- You now have the volume of the box.
What do you need help with
The given MGF is that for a random variable following a Poisson distribution with parameter

.
This means

, and

has PMF

So, the desired probability is

This is equivalent to
10.9297 anxdjehsimdudneueneieo