wrist radial deviation ROM
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interquartile range or mean absolute deviation.
The range and mean absolute deviation are: Range = 29 Mean absolute deviation = 8.8
A standard deviation in statistics is the amount at which a large number of given values in a set might deviate from the average. A percentile deviation represents this deviation as a percentage of the range.
In general you cannot. You will need to know more about the distribution of the variable - you cannot assume that the distribution is uniform or Normal.
characteristics of mean