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When telephone subscribers from the national magazine company call; 1 8 % of people who answer stay on the call for more than a minute.

When telephone subscribers from the national
magazine company call; 18% of people who answer
stay on the call for more than a minute. If 800 people
are called in a day; find the probability that:
(a)Atleast 150 stay online for more than 1 min
(b)More than 200 stay on the line

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