The length of time of calls made to a support helpline follows an exponential distribution with an average duration of 20 minutes so that λ = = 0.05. (Round your answer to four decimal places.) 20 (a) What is the probability that a call to the helpline lasts less than 10 minutes? 0.3965 X (b) What is the probability that a call to the helpline lasts more than 30 minutes? 0.2231 (c) What is the probability that a call lasts between 20 and 30 minutes? 0.1448 x

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