QUESTION 3 a) The waiting time at an elevator in a shopping mall is approximately normally distributed with a mean of 3.2 minutes and a standard deviation of 1.5 minutes. i) What is the probability if the waiting time is at most 2.8 minutes? iii) Find the probability that the waiting time is more than 3 minutes. ii) Find the value of kif 95% of all the customers are having waiting time of less than k minutes.

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