Mathematics, 06.06.2020 14:58, Kaylenejohnson00
1.(a) The life time of a certain brand of bulbs produced by a company is normally distributed, with mean 210 hours and standard deviation 56 hours. What is the probability that a bulb picked at random from thiscompany’s products will have a life time of:
(i)at least 300 hours,
(ii)at most 100 hours,
(iii)between 150 and 250 hours.
(b) In a contest, two friends, Kofi and Mensah were asked to solve a problem. The
probability that Kofi will solve it correctly is ' and the probability that Mensah
(
will solve it correctly is ) . Find the probability that neither of them solved it correctly.
*
Answers: 1
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1.(a) The life time of a certain brand of bulbs produced by a company is normally distributed, with...
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