b. If we poll a random sample of 377 Americans, what is the probability that Trump’s approval rating in this sample will be less than 36%?

N=377, p=0.38 Np=377(0.38) = 143.26 >= 10

N(1-p) = 377(0.62) = 233.74 >= 10

So we can use the normal approximation.

Using StatCrunch: