Use the empirical rule to solve the problem.
-The lifetimes of lightbulbs of a particular type are normally distributed with a mean of 210 hours and a standard deviation of 5 hours. What percentage of the bulbs have lifetimes that lie within 1 Standard deviation to either side of the mean?
A)95.44%
B)31.74%
C)84.13%
D)68.26%

Question

Use the empirical rule to solve the problem.
-The lifetimes of lightbulbs of a particular type are normally distributed with a mean of 210 hours and a standard deviation of 5 hours. What percentage of the bulbs have lifetimes that lie within 1 Standard deviation to either side of the mean? 
A)95.44%
B)31.74%
C)84.13%
D)68.26%

Quizplus · Accepted Answer

The empirical rule states that for a normally distributed dataset, approximately 68% of the data falls within one standard deviation of the mean.

Use the Empirical Rule to Solve the Problem