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The quadratic mean is a measure of the spread of values about their arithmetic mean. By definition, the arithmetic mean of the differences will be zero and so adds no information. Another measure is required and that is the quadratic mean.
49 (it is an arithmetic series that adds 5 then 7 then 9 then 11 then 13)
She obtained the average speed of the three measurements.
-16
Any number adds to 15.