The mean of five numbers is 220. If one number is excluded, the mean of the remaining four numbers becomes 180. What is the excluded number?
380
Sum of the five numbers \(= 220 \times 5 = 1100\).
Sum of the remaining four numbers \(= 180 \times 4 = 720\).
The excluded number \(= 1100 - 720 = 380\).
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