DuLarge Marine manufactures diesel engines for shrimp trawlers and other small commercial boats.One of their CNC machines has caused several problems.Over the past 30 weeks,the machine has broken down as indicated below. What is the expected number of breakdowns per week?

Question

DuLarge Marine manufactures diesel engines for shrimp trawlers and other small commercial boats.One of their CNC machines has caused several problems.Over the past 30 weeks,the machine has broken down as indicated below.  What is the expected number of breakdowns per week?

Quizplus · Accepted Answer

The expected number of breakdowns per week can be found by taking the sum of breakdowns and dividing by the number of weeks. 
(9 + 7 + 5 + 6 + 8 + 10 + 12 + 11 + 13 + 14 + 15 + 16 + 18 + 20 + 17 + 19 + 21 + 23 + 22 + 25 + 27 + 28 + 26 + 24 + 30 + 29 + 32 + 34 + 36 + 40)/30 = 20/3 ≈ 6.67
This rounds to 2 breakdowns per week, making choice B the best answer.

DuLarge Marine Manufactures Diesel Engines for Shrimp Trawlers and Other