The diameters of ball bearings produced in a manufacturing process can be described using a uniform distribution over the interval 8.5 to 10.5 millimeters. Any ball bearing with a diameter of
Over 10.25 millimeters or under 8.75 millimeters is considered defective. What is the probability
That a randomly selected ball bearing is defective?
A) .50
B) 0
C) .75
D) .25

Question

Quizplus · Accepted Answer

The defective range is from 8.5 to 8.75 and from 10.25 to 10.5. Each range is 0.25 mm, so the total defective range is 0.5 mm. The total range is 2 mm (10.5 - 8.5). The probability is 0.5/2 = 0.25.

The Diameters of Ball Bearings Produced in a Manufacturing Process