The average of 7 numbers is 152. On removing a number, the average remains unchanged. Find the number removed.
152
152 is correct.
Total of the 7 numbers \(=7\times 152=1064\).
After one number is removed, 6 numbers remain with the same mean 152, so their total is \(6\times 152=912\).
Removed number \(=1064-912=152\). Removing a value equal to the mean leaves the mean unchanged.
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