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The Brainliest Answer!
2016-02-17T18:24:17+05:30
Mean score = 40

mean=sum of observation /no of observations
  
sum of observations = mean x no of observations
 
that is 40 x 100
     
           = 4000

after replacement, sum of new observation=4000-83+53
                                                                    =3970

mean of new observation = 3970/100
                                         =39.7

          
2 3 2
is the answer right?
The new sum is 3970 not 4970
oh i am really sorry...there is some problem with my keyboard
the ranswer is 3970
ya you may edit it