The life time of a light bulbs are given as follows: Number of hours less than 400 400 to 800 more than 800 What is the probability that among eight bulbs 2 will last less than 400 hours 5 will last between 400 to 800 hours and 1 will last more than 800 hours? a) b) c) d) Probability 0.3 0.5 0.2 0.9450 0.0845 0.0745 0.0945

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