The average (arithmetic mean) 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?
Sol: Since avg is given for 6 nos, we can find the sum total which is 8.5*6= 51
New average after removal of one number is 7.2 so sum total of 5 nos is 36
Discarded number is 51-36=15
Ans E
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