Maximum life for a certain part is 1100 hours. Recently, 15 parts were removed with an average life of 835.3 hours. What percent of the maximum life has the average achieved?

Maximum life for a certain part is 1100 hours. Recently, 15 parts were removed with an average life of 835.3 hours. What percent of the maximum life has the average achieved?

• A. 69.3 percent
• B. 75.9 percent
• C. 76.0 percent
• D. 74.5 percent

Answer: (B)

The idea is to express the average life as a percentage of the maximum life. Take the average life of the parts and divide by the maximum life, then multiply by 100 to convert to a percent. Here, 835.3 hours divided by 1100 hours equals about 0.75936. Multiply by 100 gives approximately 75.936%, which rounds to 75.9%. So the average life is about 75.9% of the maximum life.

The idea is to express the average life as a percentage of the maximum life. Take the average life of the parts and divide by the maximum life, then multiply by 100 to convert to a percent. Here, 835.3 hours divided by 1100 hours equals about 0.75936. Multiply by 100 gives approximately 75.936%, which rounds to 75.9%. So the average life is about 75.9% of the maximum life.