A manufacturer of tow chains finds that the average breaking point is at 3,500 pounds and the standard deviation is 250 pounds.If you pull a weight of at least 4200 pounds with this tow chain,what percentage of the time would you expect the chain to break?
A) 2.8%
B) 0.26%
C) 49.74%
D) 99.74%
E) 50%

Question

Quizplus · Accepted Answer

We can use the standard normal distribution to find the percentage of the time the chain would break:
Z = (4200-3500)/250 = 2.8
Using a standard normal distribution table, we can find that the percentage of the time that the chain would break is approximately 0.26%. Therefore, the best choice is B.

A Manufacturer of Tow Chains Finds That the Average Breaking