# Formula for mean,median and mode

Ans :    Mean of grouped data  ,   if  x1 ,x2 ,x3 ,........ ,xn are n value of variable X then

Mean =( x1 + x2 + x3 + ........ + xn ) / n         Median = if n is odd ,then median is the value of [ ( n+1) /2]th observation , if n is even , then median is the AM of the  value of ( n/2) th and [(n/2) +1 ]th observation

If a variable X takes value x1 , x2 , x3 ,........ ,xn  with corresponding frequencies f1 , f2 , f3 ,...... fn respectively

Mean = (f1*x1 + f2*x2 + f3*x3 + ......+fn* xn) / (f1 + f2 +.........+fn)

Mode: = 3 Median - 2 Mean

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