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Question

Find the mean of the following distribution :

x:4691015f:5101078


  1. 7

  2. 8

  3. 9

  4. 10


Solution

The correct option is C

9


x:4691015f:5101078fixi:20609070120
Now, fixi=20+60+90+70+120                        =360fi=4+6+9+10+15=40Mean=fixifi          =36040          =9

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