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The mean of 5 observations is 15 . If mean of the first three observations is last three is 17 , the third observation is (a) 17 (b) 18 (c) 19 (d) 20
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The mean of 5 observations is 15 . If mean of the first three observations is last three is 17 , the third observation is (a) 17 (b) 18 (c) 19 (d) 20

User Pesho Hristov
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The mean of 5 observations is 15 . If mean of the first three observations is last-example-1
User FeelTheBurns
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