A fiber spinning process produces a fiber whose strength is normally distributed with average of 78.9 N/m2 and a variance of 30 (N/m2)2 The minimum acceptable resistance is 65.7 N/m2 . a) What proportion of fibers will not meet the strength requirement? b) What will be the strength of a fiber that is in the 33rd percentile of the resistors? c) What proportion of fibers will meet the strength requirement?

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A fiber spinning process produces a fiber whose strength is normally distributed with
average of 78.9 N/m2
and a variance of 30 (N/m2)2
The minimum acceptable resistance is 65.7 N/m2
.
a) What proportion of fibers will not meet the strength requirement?
b) What will be the strength of a fiber that is in the 33rd percentile of the
resistors?
c) What proportion of fibers will meet the strength requirement?

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