The mean deviation of a set of observations is always zero and so conveys no information whatsoever!
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How many standard deviations is 16.50 from the mean?
multiply the mean by the amount of numbers
Differing from standard deviations, the coded deviation method finds the mean of grouped data from the assumed mean using unit deviations. This is a shorter way to find the mean.
95 percent of measurements are less than 2 standard deviations away from the mean, assuming a normal distribution.
It is mean + 2*standard deviation.