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Find Quartiles, Deciles and Percentiles for ungrouped data
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Standard deviation `sigma` formula -
  1. Auto Select method
  2. Method-1 : `sigma = sqrt((sum x^2 - (sum x)^2/n)/n)`
  3. Method-2 : `sigma = sqrt((sum (x - bar x)^2)/n)`
    Or `sigma = sqrt((sum dx^2 - (sum dx)^2/n)/n)`
  1. `85,96,76,108,85,80,100,85,70,95`
  2. `3,13,11,15,5,4,2`
  3. `3,23,13,11,15,5,4,2`
  4. `69,66,67,69,64,63,65,68,72`
  5. `4,14,12,16,6,3,1,2,3`
  6. `73,70,71,73,68,67,69,72,76,71`
  7. `10,50,30,20,10,20,70,30`
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