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The mean of 20 observations is 15. On ch...

The mean of 20 observations is 15. On checkingit was found that two observations were wronglycopied as 3 and 6. If wrong observations arereplaced by correct values 8 and 4, then the correct mean is (1) `15` (2) 1`5.15` (3) `16.15` (4) `17`

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