The mean of the four observation is 12 . if 1st ,2nd , 3rd , and 4th observation are deacrease by 1,2, 3, and 4 respectivly then
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Step-by-step explanation:
Given that Mean of 4 observations = 12. Given that if 1st,2nd,3rd,4th observations are decreased by 1,2,3 and 4. = 9.5. Therefore the new mean = 9.5
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