Question 5 The lifetimes, in hours, of a certain make of light bulbs are assumed to be Normally distributed with a mean

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Question 5 The lifetimes, in hours, of a certain make of light bulbs are assumed to be Normally distributed with a mean

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Question 5 The Lifetimes In Hours Of A Certain Make Of Light Bulbs Are Assumed To Be Normally Distributed With A Mean 1
Question 5 The Lifetimes In Hours Of A Certain Make Of Light Bulbs Are Assumed To Be Normally Distributed With A Mean 1 (49.58 KiB) Viewed 21 times
Question 5 The lifetimes, in hours, of a certain make of light bulbs are assumed to be Normally distributed with a mean of 5500 hours and a standard deviation of 120. a) Find the probability that the lifetime of a light bulb picked at random will exceed 5764 hours. [3] b) Determine the lifetime not achieved by 0.4% of these light bulbs. [3] Thirty of these light bulbs are selected. c) Find the probability that two out of these thirty light bulbs will have a lifetime exceeding 5764 hours. [4]
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