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Question

No of studentsMarks
1080
575
570
260
255
120
Tina's score was accidentally omitted from the list. When her score is added, the average (arithmetic mean) score for the class does not change. What is Tina's score?
  1. 68
  2. 69
  3. 70
  4. 71

A
68
B
71
C
69
D
70
Solution
Verified by Toppr

If the Average score of the class does not change when Tina's score is added .
So Tina's score is equal to the average score.
Average = 10×80+5×75+70×5+60×2+55×2+×20×110+5+5+2+2+1
800+375+350+120+110+2025=177525=71
Tina's score =71

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