Variance formula-help

you can develop mobile no. tennique for variances formulla........

its difficult to post right now.. but i will try it latter... thnaks for reminding my tecnique i will post very soon.

Its not a big dealbut not a smaller one...You just have to understandthe concept behind the formulas rather than graming it(Refer a good book it 'll definitely give you concepts behind formula. If you still need some clearity in formulas can notify me in Club  .

Dear Ca Lokesh please send me some notification so I can also see a new technique from you.