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DUYS.The mean of five observations is 17. If the mean of the first three of these observations is 15and that of the last three is 18, find the third observation. |
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Answer» Total sum of 5 observation=17×5=85 total sum of 1st 3 observation=15×3=45 total sum of last 3 observation=18×3=54 3rd observation =(45+54)-85=99-85=14 |
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