Question

A manufacturer makes ceramic heaters that have a life expectancy of 10 years. Two percent of the heaters are defective because they break down after the first month. If the manufacturing process is improved so that the number of defective units drops to 1%, how will the life expectancy of the heaters change?
A. The life expectancy will remain unchanged at 10 years.
B. The life expectancy will decrease to less than 10 years.
C. The life expectancy will increase to more than 10 years.
D. The life expectancy will double.

I got B for this one.

Answer 1

The number of defective units is now less...so, they're getting better! The life expectancy will therefore increase.

Answer 2

so C right?

Answer 3

Yes