There is a statistical table to estimate the average height of mathematics in the fourth grade of primary school, and there is a lot of data in the statistical table. How to estimate the average value? Personally, I think it can be folded and readjusted many times.

That is, the maximum value plus the minimum value divided by 2 (half), and then estimate whether the data is greater than this half or less than this half;

If it's almost the same, use this half, or turn it up or down slightly. If the difference is large, add half of the maximum (or minimum), divide by 2 (the second half), then estimate the quantity, and so on.

Personal point of view.