The mean temperature for the first 4 days in January was 1°C. The mean temperature for the first 5 days in January was -1°C.
What was the temperature on the 5th day?

The temperature on the 5th day was of -9ºC.

Step-by-step explanation:

Mean of a data-set

The mean of a data-set is the sum of all values in the data-set divided by the number of values.

The mean temperature for the first 4 days in January was 1°C.

This means that during the first 4 days, the sum of the temperatures was 4*1 = 4ºC.

The mean temperature for the first 5 days in January was -1°C.

First 4 days: Sum of 4º

5th day: Temperature of x.

The mean is -1, so:

The temperature on the 5th day was of -9ºC.

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step-by-step explanation:

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