The standard deviation varies from one data set to another. Indeed, 100 may not even be anywhere near the range of the dataset.
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to find percent deviation you divide the average deviation into the mean then multiply by 100% . to get the average deviation you must subtract the mean from a measured value.
Standard deviation is 0.
A single number, such as 478912, always has a standard deviation of 0.
Bob scored 300 or 700.
100 x (standard deviation/mean)