Question

Mark recorded the temperature each day for a week.

He calculated the mean temperature and found it was 21.6°C
Mark’s thermometer was not working properly. All seven temperatures were 3° too high.
Write down the correct mean temperature.

Answer 1

Explanation:

130.2/7= 18.6

Before finding the correct form you need to find their total sum and subtract 21 from it since the number of temperature recordings are 7