In the morning the thermometer showed 23 degrees, and in the afternoon 20 degrees

In the morning the thermometer showed 23 degrees, and in the afternoon 20 degrees, and in the evening 26 degrees, what is the average temperature for the day.

The average temperature for the whole day will be the arithmetic average of the temperatures in the morning, afternoon and evening.
The arithmetic mean of three numbers can be found by the formula:
A = (a₁ + a₂ + a₃) ÷ 3;
Let’s perform the necessary calculations:
A = (23 + 20 + 26) ÷ 3;
A = 69 ÷ 3;
A = 23;
Answer: The average temperature for the whole day is 23 degrees.