(Answered) Problem bearings are manufactured at a rate of 1000

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Problem: Bearings are manufactured at a rate of 1000 bearings per day. For a large of bearings, their diameter was normally distributed with a mean of µ = 2.505 in and standard deviation of σ = 0.008 in

The specification calls for an acceptable diameter to be in the interval 2.500 (+ -) 0.010 in

1. Calculate the Median the 25^th and the 75^th percentiles.

2. What is the percentage of shafts that will meet the above specifications?

3. To reduce the number of rejected bearings, a new process was started such that the actual mean shaft diameter µ=2.500 in and the standard deviation is 0.009in

We require that 95% of the bearings meet specification for the calibrated process.

What is the new range for the acceptable diameters?

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