Smith is a weld inspector at a shipyard. He knows from keeping track of good and substandard welds that forthe afternoon shift 5% of all welds done will be substandard. If Smith checks 300 of the 7500 welds completedthat shift, would it be unusual for Smith to find 30 or more substandard welds?
A) Yes
B) No

Question

Quizplus · Accepted Answer

The expected number of substandard welds in a sample of 300 is 5% of 300, which is 15. Finding 30 or more substandard welds is significantly higher than expected, making it unusual.

Smith Is a Weld Inspector at a Shipyard