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 percent of batteries last between 1.25 and 5.75 years?
A) 99.7%
B) 95%
C) 68%
D) 50%

Question

Quizplus · Accepted Answer

The range from 1.25 to 5.75 years is 3 standard deviations below and above the mean (3.5 years) in a normal distribution, which encompasses approximately 99.7% of the data according to the empirical rule.

The Shelf Life of a Battery Produced by One Major