STATISTICS FORMULAES FOR FINDING MEAN, MODE AND MEDIAN

MEAN FORMULA:-

MEAN = (ADDITION OF fixi) / fi

MEAN FORMULA:-

MEAN = a + {(ADDITION OF fixi) / fi} * h

a = assumed mean 
h = class size

MODE FORMULA:-

MODE = l + [(f1 - f0) / (2f1 - f0 - f2)] * h

l = lower limit of class of which frequency comes
f1 = frequency      f1 = n/2
f0 = preciding f0
f2 = after f0

MEDIAN FORMULA:-

MEDIAN = l + {(n/2 - cf) / f} * h

l = lower limit of class of which frequency comes
n = addition of frequency or last number cumulative frequency
h = class size

SOME OTHER EXAMPLES ARE:

SO MEAN OF THIS QUESTION IS:

BY DIRECT METHOD:

                            = fixi/fi

                            = 3620/140

                            = 25.86

BY ASSUMED MEAN METHOD:

MEAN = a + fidi/fi

             = 25 + 12/140

             = 25.86