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Homework 6
•
Homework must be answered in the order shown here (else please make a note telling the
reader where it is).
•
Write your answers neatly
•
Work must be shown for full credit
•
No late homework accepted under any circumstances
1.
The width of a slot of a duralumin forging is (in inches) normally distributed with
μ
= 0.9000
and
σ
= 0.0030. The specification limits were given as 0.9000
±
0.0050.
(a)
What percentage of forgings will be defective?
(b)
What is the maximum allowable value of s that will permit no more than 1 in 100
defectives when the widths are normally distributed with m=0.9000 and s?
2. The weight of anodized reciprocating pistons produced by Brown Company follows a normal
distribution with mean 10 lb and standard deviation 0.2lb.
a. The heaviest 2.5% of the pistons produced are rejected as overweight. What weight, in
pounds, determines the overweight classification? Give your arguments.
b. Suppose Brown Company can sell only those pistons weighing between 9.8 and 10.4 lbs.
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This document was uploaded on 03/20/2011.
 Winter '09

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