error in using sqrt function for unit

error in using sqrt function for unit

References

Reference NO 1

http://stackoverflow.com/questions/15185685/error-in-using-sqrt-function-for-unit

Reference NO 2

http://www.maplesoft.com/support/help/view.aspx?sid=7933

Reference NO 3

http://caml.inria.fr/pub/docs/manual-ocaml/libref/Pervasives.html

Reference NO 4

http://www.csc.villanova.edu/~dmatusze/resources/ocaml/ocaml.html

Reference NO 5

http://www.classzone.com/eservices/home/pdf/teacher/LA207EAD.pdf

Reference NO 6

http://www.freepascal.org/docs-html/rtl/system/sqrt.html

Reference NO 7

ftp://ftp.cs.ucla.edu/pub/milos/RECIP/paper.pdf

Reference NO 8

http://en.wikipedia.org/wiki/Standard_deviation