# Standard Normal or Z score for finding the probability

The Modulus of rupture (MOR) for a particular grade of pencil lead is known to be 6500 psi with a standard deviation of 250 psi.

a. Find the probability that a random sample of 16 pencil leads will have an average MOR between 6400 and 6550 psi.

b. What did you assume in order to find this probability?

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#### Solution Summary

This solution is comprised of a detailed explanation of standard normal distribution or z score. In this solution, a step-by-step explanation of this complicated topic provides students with a clear perspective of standard normal distribution to find the probability.

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