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Answer:

Given assumed mean  =a  =165

Sl.No.

Cost of Living Index

Class Interval

Class Mark 

(xi ) 


No.of workers

Frequency 

 ( fi )

  


Deviation

(xi  - a)  =   di



( fi )* di

1

140  -  150

      145

    5

    (-) 20

  (-) 100

2

150  -   160

      155

    10

    (-) 10   

  (-) 100

3

          160  -   170               

      165

    20

          0              

          0

4

  170  -  180

      175

      9

          10 

          90

5                       

  180  -  190

      185

      6  

          20

          120

    190  -  200

      195

      2

        30

            60

                                                      Total         =          52                                     =        70

Mean  = x    = a+ ? (fi * di )/ fi =  165 + (70/52)  = 165+ 1.35   166.35         

Answer:    166.35             

 

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