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You take measurements, each over a 1 minute time interval, and record the following number of...

You take measurements, each over a 1 minute time interval, and record the following number of counts for each measurement: 1255, 1286, 1234, 1301, and 1221. What is the standard deviation for the average of the 1 minute counts? If you take one more count, by what factor should the standard deviation of the average change?

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