1000
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Relative dispersion = coefficient of variation = (9000/45000)(100) = 20.
% increase = 38.89% % increase =|original value - new value|/original value * 100% = |90 - 125|/90 * 100% = 35/90 * 100% = 3.8889 * 10% = 38.89%
If you mean a standard index where each value is weighted by a reference value, then you just divide each value by the reference and multiply by 100. For instance, if you want to index x, y, and z based on z: (x/z)*100, (y/z)*100, (z/z)*100 Obviously, your reference value should come out to 100.
100%
The mean value of 100, 70, 70, and 20 is 65