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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%

Correct Answer:

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