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Random Selection and Normal Distribution

The diameter of a Ping-Pong ball manufactured at a factory is expected to be approximately normally distributed with a mean of 1.30 inches and a standard deviation of 0.04 inch. What is the probability that a randomly selected Ping-Pong ball will have a diameter between 1.31 and 1.33 inches?

A. 0.0987
B. 0.1747
C. 0.2734
D. 0.3721

Solution Preview

Hello!
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
http://cnx.org/content/m11328/latest/
Enter 1.30 as the mean and 0.04 as the std dev. Then choose to calculate the area ...

Solution Summary

This solution provides step by step equations and explanations for a problem involving normal distribution and random selection.

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