The Nifty and BankNifty Range for the next 10 days is computed using historical closing prices of the previous 30 trading days.
The following links provide a table that has the range for each combination of Days and Standard Deviation values.
Sample table – 
Link for BankNifty Range using SD – http://niftybanknifty.com/banknifty-range-using-standard-deviation/
Link for Nifty Range using SD – http://niftybanknifty.com/nifty-range-using-standard-deviation/
For any queries, do post your questions here in our QnA forum here – http://bit.ly/nbn_tradingqna )
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