An opinion poll asks a random sample of voters, "Do you think that elected government officials are overpaid?" Suppose that 75% of the population would respond "yes". In a sample of size 400, we are interested in finding the probability that 60% or less of the sample of voters respond "yes".

Does this problem meet the requirements to use the normal approximation (np(p-1)> 10)?

Using the Normal Approximation, what is the corresponding z-score and probability that 60% or less of the sample voters responded "yes"

z score=

probability=