statistics

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the median and modal profits for the following data

profit in 000 rs.    below 5    below 10    below 15      below 20      below 25      below 30 

no. of firms             10              25               45                   55                  62                   65

answer:

i)    11.60 and 11.50

 ii)    11556 and 11267

 iii)    11875 and 11667

 iv)    11.50 and 11.67 

Replies (1)

First convert the cumulative less than type frequency distribution into a simple continuous frequency distribution as follows

0 - 5 : 10,  5 - 10 : 15,  10 - 15 : 20, 15 -20 : 10,  20 - 25 : 7,  25 - 30 : 7

Then calculate the median class which is 10 - 15, then apply the formula of median based on interpolation as given below :

Md  =  L  + (N/2  -  C.F.) / F   x  i   =  11.875 ( in thousands)

Mo  =  L  +  (F1  -  F0) / (2F1 - F0 - F2)   x  i   =  11.666 ( in thousands)

Hence option iii is correct

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