1.

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.

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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