A loaf of bread is normally distributed with a mean of 22 ounces and a standard deviation of .5 ounces. What is the probability that a loaf of bread is < 20.75 ounces?

Answer 1

Z = (x - μ)/SD

Z = (20.75 - 22)/.5

Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion less than that Z score.