Question

In: Statistics and Probability

Suppose that 27% of all steel shafts produced by a certain process are nonconforming but can...

Suppose that 27% of all steel shafts produced by a certain process are nonconforming but can be reworked (rather than having to be scrapped).
(a) In a random sample of 167 shafts, find the approximate probability that between 30 and 54 (inclusive) are nonconforming and can be reworked.
(b) In a random sample of 167 shafts, find the approximate probability that at least 48 are nonconforming and can be reworked.

Solutions

Expert Solution

Refer Standard normal table/Z-table to find the probability OR use excel formula "=NORM.S.DIST(1.64, TRUE)" & "=NORM.S.DIST(-2.72, TRUE)" to find the probability.

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Refer Standard normal table/Z-table to find the probability OR use excel formula "=NORM.S.DIST(0.42, TRUE)" to find the probability.

orchestra answered 3 years ago
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