Ball-Bearings, Inc

Multiple Choice

Ball-Bearings, Inc. produces ball bearings automatically on a Kronar BBX machine. For one of the ball bearings, the mean diameter is set at 20.00 mm (millimetres) . The standard deviation of the production over a long period of time was computed to be 0.150 mm. What percent of the ball bearings will have diameters 20.27 mm or more?

A) 41.00%
B) 12.62%
C) 3.59%
D) 85.00%
E) None of the choices are correct