1.

The mean of 5 numbers is 20. If one number is excluded, mean of the remainingnumbers becomes 23. Find the excluded number.

Answer»

Mean of 5 numbers = 20Sum of 5 numbers = 20×5 = 100

if one is excluded, mean of 4 numbers = 23Sum of 4 numbers = 23×4= 92

The number excluded= 100 - 92 = 8



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