Once a century, a very special day comes along. That day is today — 9/16/25. Pi Day (3/14) often comes with sweet treats; Square Root Day (4/4/16 or 5/5/25, for example) has a certain numerical rhyme.

MUMBAI: Indians are avid social media enthusiasts who are always willing to engage in a good game or trend online. Monday is their chance. May 5 this year is 5/5/25 or what is called Square Root Day.

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Manufacturers who use the square root of N plus one rule as part of their overall sampling plan may be surprised to learn of its inadequacies and whether it truly represents the entire batch.

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