Question

A manufacturer of springs tests a random sample of 150 springs and finds that 2 springs fail a stress test. The manufacturer will ship 5000 springs in its next shipment.


What is the best prediction for the number of springs in the next shipment that will fail under stress?

A.
67

B.
75

C.
133

D.
150

Answer 1

The answer is A. 67 You take the whole lot 5000 and divide by the sample size 150. This break down to 33.333 take that number and multiply it by two since for every 1 sample group 2 springs broke. There's your answer.

Answer 2

Thanks! :)