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20 adults each walk 80 minutes a week on average (SD 10) and 11 children 50 minutes (SD 20), all independently. What is the standard deviation of the total minutes walked?

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A neighbourhood has 20 adults who each walk on average 80 minutes a week with standard deviation 10 minutes, and 11 children who each walk on average 50 minutes a week with standard deviation 20 minutes, independently. What is the standard deviation of the total minutes walked in the neighbourhood?

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