Question

Assuming that 50% is the true percentage of graduates who start at their first job less than two years, find the mean and standard deviation of the numbers of such graduates in random selected groups of 350 graduates

Answer 1

Binomial?

350 * 0.5 = Mean
350 * 0.5 * (1 - 0.5) = Variance

Ringing any bells? You just have to know it.

Answer 2

This is so confusing.

Answer 3

Some things just need to be memorized.