The mean of 10 numbers is 47.if a number is added then the mean increases by 1.Find the new number.
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Step-by-step explanation:
Mean of 10 numbers = 47
Sum of 10 numbers = 10×47 = 470
Let the new number added = x
New mean ( 11 numbers) = 49
Sum of 12 numbers = 49×11 = 539
Hence. 470+x = 539
⇒x=69
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