Taxi has found that the response time (in minutes) for a pickup is normally distributed with mean µ = 12 and standard deviation ? = 2.1. a. What is the probability that the response time for a randomly selected pickup call will be at  most 10 minutes? b. For a random sample of 19 pickup calls, what is the probability that the sample mean  response time is not less than 12.5 minutes?

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