Smith Is a Weld Inspector at a Shipyard

Multiple Choice

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, what is the probability that he will find between 10 and 20 substandard welds?

A) 0.8132
B) 0.4066
C) 0.2033
D) 0.6377