The life of a certain make of electric light bulb is known to be normally distributed with
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The life of a certain make of electric light bulb is known to be normally distributed with a mean life of 2000 hours and a standard deviation of 120 hours. Estimate the probability that the life of such a bulb will be
(a) greater than 2150 hours,
(b) greater than 1910 hours,
(c) within the range 1850 hours to 2090 hours. (C)
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A Concise Course In Advanced Level Statistics With Worked Examples
ISBN: 9780748754755
4th Edition
Authors: J. Crawshaw, J. Chambers
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