The arithmetic mean of numbers a, b , c , d , e is M . What is the value of ( a − M ) + ( b − M ) + ( c − M ) + ( d − M ) + ( e − M )?

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Given M = 5 a + b + c + d + e ​ ⇒ a + b + c + d + e = 5 M ⇒ a + b + c + d + e − 5 m = 0 ⇒ ( a − M ) + ( b − M ) + ( c − M ) + ( d − M ) + ( e − M ) = 0 ​ Hence, required value = 0

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