A recent poll conducted by a space consultant based in Houston, TX found that 25% of people aged 18 - 15 have doubt that the 1969 lunar landing actually happened. Consider a random sample of 30 people between the ages of 18 and 25.

A. what is the mean or expected value of this binomial probability distribution pls use formula

B. what is the probability that exactly 1 of these 30 young people are lunar landing doubters? Pls fill in the formula and calculate the probability to four decimal place

nCxPx(1-p)n-x