7+x, because the sum means adding.
8 16/1000 = 8 2/125
Keep whole number the same, divide the numerator and denominator by 8.
Answer:
(x + 39) or x = -39
Step-by-step explanation:
Set f(x) to 0
0 = 5x + 195
5x = -195
x = -39
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