Question

If the specifi cation is such that no washer should be greater than 2.4 millimeters, assuming that the thicknesses are distributed normally, what fraction of the output is expected to be greater than this thicknes

Answer 1

Answer:

The average thickness in the sample is 1.9625 and the standard deviation is .209624.

The probability that the thickness is greater than 2.4 is  

Z = (2.4 – 1.9625)/.209624 = 2.087068 1 - NORMSDIST(2.087068) = .018441 fraction defective,

so 1.8441 percent of the washers are expected to have a thickness greater than 2.4.

Explanation: