The mean high temperature of the first four days of a week is 25°C whereas the

Question

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

Options:

A . 25.2°C

B . 25.6° C

C . 25°C

D . 25.5°C

Answer: Option B
Answer: (b)Temperature on 4th day = (4 × 25 + 4 × 25.5 –25.2 × 7)°C = (100 + 102 – 176.4)°C = 25.6°C

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