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LIST OF FORMULES, , l., , Mean x, , Ls Xx. x., (a) For raw data y = 2X; _ tytn, nt n, , _ sum of observations, i, Cio ., x no of observations, , (b) For Grouped data, (i) Ifsmall calculation then we apply Direct method, aes Li Xi, xe Sh, (ii) If calculations are tedius or observations are large then we apply short cut/, Assumed Mean method or step Deviation method, Short cut/Assumed Mean Method, 2d Sidi, , x =at sf , a— assumed mean, 5 i, , , , Step Deviation Method, , Liu;, sy. ae oe 5;, , >|, , , h > class size, , Median, , (a) For ungrouped data we first arrange data in ascending or descending order., , n+l e, Count number of times say n. If n is odd then Median = (A) observation, , th th, n n, a 2: ie v 7 3 1, It is even then Median = \2 2 obsevation