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The mean of 13 observations is 14. If the mean of the first 7 observations is 12 and that of the last 7 observations is 16, find the 7th observation. |
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Answer» Step-by-step explanation: SUM of all observations =13×14=182 Sum of the FIRST 7 observations =7×12=84 Sum of the last 7 observations=7×16=112 Sum of the first 7 observations + Sum of the last 7 observations = sum of TOTAL terms + 7 th term$$ ⇒84+112=182+7 th term Therefore, 7 th term =196−182=14 |
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