The shelf life of a battery produced by one major company is known to be Normally distributed, with a mean life of 3.5 years and a standard deviation of 0.75 years. What range of years contains 68% of all battery shelf lives?
A) 2 to 5 years
B) 2.5 to 4.5 years
C) 2.83 to 4.17 years
D) 2.75 to 4.25 years

Question

Quizplus · Accepted Answer

The range containing 68% of the data in a normal distribution is within one standard deviation from the mean. Therefore, it is 3.5 ± 0.75, which is 2.75 to 4.25 years.

The Shelf Life of a Battery Produced by One Major