# 5-89. A plastic casing for a magnetic disk is composed of two halves. The thickness of

**Chapter 5, Problem 5-89**

(choose chapter or problem)

5-89. A plastic casing for a magnetic disk is composed of two halves. The thickness of each half is normally distributed with a mean of 2 millimeters and a standard deviation of 0.1 millimeter and the halves are independent. (a) Determine the mean and standard deviation of the total thickness of the two halves. (b) What is the probability that the total thickness exceeds 4.3 millimeters?

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