Standard Deviation

How to calculate standard Deviation duration, minimum and maximum duration, Duration 85/90/95 Percentile, Standard deviation size, Minimum and Maximum size, size 85 /90/95 percentile in the iteration summary report?

All the above mentioned calculation’s in the iteration summary are done at back-end i.e. it is all based on algorithms which calculates the values for each of it and no Mathematical calculation to be done in the front end to obtain the results in the iteration summary report.