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Apply the68-95-99.7 rule to answer the question. The lifetimes of light bulbs of a particular normally distributed with a mean of 360 hours and a
Apply the68-95-99.7 rule to answer the question.
The lifetimes of light bulbs of a particular normally distributed with a mean of 360 hours and a standard deviation of 10 hours. What percentage of the bulbs have lifetimes that lie within 2 standard deviations to either side of themean?
A.
99.7%
B.
98%
C.
68%
D.
95%
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