The mean of 5 numbers is 43. If one of the number is excluded, the mean gets reduced by 3. Find the excluded number.
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Step-by-step explanation:
Mean of 5 numbers = 43
Sum of these numbers =43×5=215
(∵nx=∑x)
Mean of 4 numbers =43 −4=40
Sum of these 4 numbers =40×4=160
Excluded number = (Sum of the 5 given numbers) − (Sum of the 4 numbers)
= 215-160
=55
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