Use the Empirical Rule to Solve the Problem

question 134

Multiple Choice

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%

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