Question

Average of 20 observations calculated by a student was

Q: Answer-Average of 20 observations calculated by a student was 85 but when he again went through his observa...

Sum of 20 observations 20 85 1700 Original average 1700 90 12 75 - 52 60 5519 171019 90

85 but when he again went through his observations he realised that he took value of three observations as 52, 60 and 55 in place of 90, 12 and 75 respectively and also realised that total observations taken by him was 19. Find the original average of all observations taken by him.

A 90

B 98

C 80

D 94

E None of these

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Average of 20 observations calculated by a student was

Solution