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The lifetimes of light bulbs that are advertised to last for 5, 000 hours are nor-...

The lifetimes of light bulbs that are advertised to last for 5, 000 hours are nor- mally distributed with a mean of 5, 100 hours and a standard deviation of 200 hours. What is the probability that a bulb lasts longer than the advertised figure?

Math   Statistics-And-Probability   
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Answer #1

Given:

Mean, = 5100

Standard deviation, = 200

The lifetimes of light bulbs that are advertised to last for 5000 hours are normally distributed .

So the probability that a bulb lasts longer than the advertised figure is

Therefore the probability that a bulb lasts longer than the advertised figure is 0.6915.

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