The lifetime of the "Roadwalker RB4" automobile tire (in thousands of miles) is normally distributed with a mean of 38 and a standard deviation of 5.5. Find the following probabilities, rounded to 4 decimal places. a) What is the probability 22 randomly chosen tires have a mean lifetime greater than 40 thousand miles? Would it be unusual or usual for this to happen? Select an answer v b) What is the probability 20 randomly chosen tires have a mean lifetime less than 36 thousand miles? Would it be unusual or usual for this to happen? Select an answer ♥

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