What is the percentage of people taking the test score between 370 and 592?

Question

The mean is 592, the standard deviation is 111, it uses the 68–95–99.7 rule

Answer 1

z = (x-mu)/sigma

for x = 592, z = 0

for x = 370, z = -2

using the normal distribution table, pby(-2 < z <0) = .477