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The mean high temperature of the first four days of a week is 25°C whereas the mean of the last four days is 25.5°C. If the mean temperature of the whole week is 25.2°C then the temperature on the 4th day is
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- 25.5°C
- 25°C
- 25.2°C
- 25.6° C
- 25.5°C
Correct Option: D
Temperature on 4th day = (4 × 25 + 4 × 25.5 – 25.2 × 7)°C
Temperature on 4th day = (100 + 102– 176.4)°C
Temperature on 4th day = 25.6°C
