This tool computes the percent deviation of a sequence of data from a standard value.
To use the calculator enter the
- sequence of values, each separated by a comma
- standard value
xMean = (1/n)*(x1 + x2 + … + xn)
D% = ((xMean – xStd)/xStd)*100
For a set of values 1, 5, 9 and a standard value of 7, the percent deviation can be calculated as follows:
- Find the mean value. In this case it is (1+5+9)/3 = 5.
- The percent deviation is ((5-7)/7)*100 = -28.57%
In the event that the sequence consists of only one value, say 12 then the mean value is also 12. The percent deviation is ((12-7)/7)*100 = 71.43%