SOLUTION: Light Bulb Life Span • The life span of a certain type of light bulb is normally distributed with a mean of 5000 hours and a standard deviation of 150 hours. Estimate the probabil

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Question 322734: Light Bulb Life Span • The life span of a certain type of light bulb is normally distributed with a mean of 5000 hours and a standard deviation of 150 hours. Estimate the probability that this type of light bulb has a life span is between 4850 and 5300 hours.

Answer by stanbon(75887) About Me  (Show Source):
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Light Bulb Life Span • The life span of a certain type of light bulb is normally distributed with a mean of 5000 hours and a standard deviation of 150 hours. Estimate the probability that this type of light bulb has a life span is between 4850 and 5300 hours.
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z(4850) = (4850-5000)/150 = -1
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z(5300) = (5300-5000)/150 = 2
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P(4850 < x < 5300) = P( -1 < z < 2) = 0.8186
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Comment: This is a standard procedure. Are you beginning
to understand it?
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Cheers,
Stan H.