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The mean high temperature of the firs...

The mean high temperature of the first four days of a week is `25^oC` whereas the mean of the last four days is `25. 5^0 C` . If the mean of the whole week is `25. 2^oC` , then the temperature of the 4th day is (a) `25. 2^oC` (b) `25. 5^oC` (c) `25. 6^oC` (d) `25^oC`

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