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A commuter finds that she waits an average of 18.5 seconds at each of four toplights, with a standard deviation of 6.5 seconds.
A commuter finds that she waits an average of 18.5 seconds at each of four toplights, with a standard deviation of 6.5 seconds. Find the mean and the standard deviation of the total amount of time she waits at all four lights. What, if anything, did you assume?