Question

Look closely at the scale on the y-axis. what number would be represented by the point midway between the tick mark labeled 10 and the tick mark labeled 100?

Answer 1

The answer is approximately 32<span />

Answer 2

If the scaling or the graduation on the y-axis is uniform (not logarithmic), then the spaces between tick marks have the same value. If there is a tick mark labeled 10 and another labeled 100, the point midway them would have a value of 
(10 + 100) / 2 = 55<span />