The diameter of a Ping-Pong ball manufactured at a factory is expected to be approximately normally distributed with a meanof 1.30 inches and a standard deviationof 0.04 inch. What is the probabilitythat a randomly selected Ping-Pong ball will have a diameter between 1.31 and 1.33 inches?
The correct answer is B.
This question can be easily solved using a calculator (I will explain below how to do it with the standard normal table instead of a calculator).
I use the online calculator at
Enter 1.30 as the mean and 0.04 as the std dev. Then choose to calculate the area …
This solution provides step by step equations and explanations for a problem involving normal distribution and random selection.