Question

when 100 engines are shipped, all of them are free of defects. select a written description of the complement of the given event
a. none of the engines are defective
b. at least one of the engines is defective
c. at most one of the engines is defective
d. all of the engines are defective

Explanation:

The complement of an event is all outcomes that are not part of the original event. The original event is "all 100 engines are free of defects", so its complement is any outcome where this is not true, meaning at least one engine has a defect.

Answer:

B. At least one of the engines is defective