Question

Each American uses an average of 650 pounds of paper in a year. Suppose that the distribution is approximately normal with a standard deviation of 154 pounds. Find the probability that a randomly selected American uses less than 795 pounds of paper in a year.

Answer 1

Let's find z first using the next formula

$z=\frac{795-650}{154}=0.94$

then we need to find the probability using the next tables

therefore the probability that a randomly selected American uses less than 795 pounds of paper in a year will be 0.8264