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.11 .'i ('1 ."1 ."'1 Question 20 The time between customer service calls to a computer-repair hotline follows an exponential distribution with an expectation of 2 minutes between calls. We collect calls for 40 minutes at random times during the month (a sample of size n=40}. What is the probability that the mean of our sampling distribution will be greater than 2.2 minutes? Select one: a. .1? b. 3; c. .3? d. .68 e. .'fB