A firm is In the business of manufacturing life
support systems. On an average, the mean time for
which a life support system works is 16 years
with a standard deviation of a years. Assuming
that the time for which the life support system
works is normally distributed. What is the probability that a man randomly selected life support
system will (I) Work for more than 20 years?
(ii) last between 18 and 20 years?
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