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1.
The average of 6 number is 8.5, when one number is discarded the average of the remaining numbers becomes 7.2. What is the discarded number?
- A. 7.8
- B. 7.8
- C. 7.8
- D. 7.8
Answer: Option E
Explanation:
The average of 6 numbers is 8.5
So, the sum of 6 numbers is 8.5x6 or 51
The average of 5 numbers is 7.2
So, the sum of 5 numbers is 7.2x5 or 36
So, the discarded number is 51 - 36 or 15
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