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The time that it takes a person to complet a survey is normally distributed with a mean of 18 minutes and a standard deviation of 3.5 minutes.
(a) If a person is chosen at random, what is the probability that the person took longer than 19 minutes to complete the survey?
(b) What proportion of the population took betweeen 16.5 and 19 minutes to complete the survey?
(c) Find the 45'th percentile.
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