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A commuter finds that she waits an average of 18.6 seconds at each of five stoplights,...

A commuter finds that she waits an average of 18.6 seconds at each of five stoplights, with a standard deviation of 8.9 seconds. Find the mean and the standard deviation of the total amount of time she waits at all five lights.​ What, if​ anything, did you​ assume?

Math   Statistics-And-Probability   
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