Suppose you know that the heights of elementary school students in
southern Kenya follow a normal probability distribution with a mean of
40.1 inches and a (population) standard deviation of 2.2 inches.
is the probability that an elementary school student in southern Kenya
is greater than or equal to 41.3 inches tall? (Round to the nearest
z score is (x - mean)/standard deviation
so (41.3 - 40.1)/2.2
and look up that on a standard normal distribution chart