How to calculate daily volatility given on nseindia.com

Hi,

If someone can help me to get formula for calculation of daily volatility for fno stock as per shown on nseindia.com

ok found this https://zerodha.com/varsity/chapter/volatility-calculation-historical/

How did you get to this nse page (shown in picture) ? I need the daily volatility of tatasteel … kindly help!!

While searching stock, select Equity Derivatives first.
By default it searches in Equity segment

Thank you so mch brother

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