When the Average Increases or Decreases ?

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When the Average Increases or Decreases ?

Question: The average score of 10 students is 50. When the score of one student is removed, the average becomes 48. Find the score of the student who was removed.

1^st : Find the total score of 10 students

50 × 10 = 500

2^nd : Find the total score of the remaining 9 students

48 × 9 = 432

3^rd :Find the removed student’s score

500−432=68

Score of the removed student = 68

Shortcut Tips to Remember

• Total Sum = Average × Number of Items


• Missing Number = Total Sum − Sum of Given Numbers


• If one number is removed, the difference between the two totals (before and after) = that removed number.