Question

If 80% of the applicants are able to pass a driver's proficiency road test, find the mean, variance, and standard deviation of the number of people who pass the test in a sample of 300 applicants.

Answer 1

Your values are the following:
p = .8, q = 1 - p = .2, and n = 300

Therefore:
mean = np = (300)(.8) = ?
variance = npq = (300)(.8)(.2)= ?
standard deviation = square root of the variance

I'll let you take it from here.

Answer 2

Answer