# The mean temperature for the first 4 days in January was -11°C.

The mean temperature for the first 5 days in January was -13°C.

What was the temperature on the 5th day?

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jinc0930The mean temperature is -11 for the first four days, meaning their sum must be -11*4=-44C from that, we know -44+x=-13*5 now we solve for x x=-65+44 x=-21 The temperature for the fifth day is -21°C