The average of 6 numbers is 8.5 , when one number is discarded the average of the remaining numbers becomes 7.2 .what is the discarded number?
None of them
12.4
10.0
15
7.8/
Description (বিবরণ) :
প্রশ্ন: The average of 6 numbers is 8.5 , when one number is discarded the average of the remaining numbers becomes 7.2 .what is the discarded number?
ব্যাখ্যা:
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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