the average of a set of 20 values is 15.8. the mean increases by 0.4. when a mean value is added to the set, then what will be the new value

• (21*(15.8+0.4))-(20*15.8)=24.2
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• Since the Average of the 20 values is 15.8
  total is 20*15.8=316
  then a value is added and the mean is increased by 0.4 =>15.8+0.4=16.2
  then total numbers is 21
  therefore (16.2*21)-316=340.2-316=24.2
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