The height of a bluebird was measured in centimeters. If the ruler reads 10.599 centimeters, what is the lower real limit of the bluebird's height?

I know the lower limits of 10 are 9.5 or 10.5 after we go further I don't understand how to get the rest of the real limits of a number.

To find the lower real limit of a measurement, you need to consider the precision of the measuring instrument. In this case, the ruler reads up to the nearest 0.001 centimeters.

The rule for finding the lower real limit is to subtract half of the smallest unit of measurement from the recorded value.

In this case, the smallest unit of measurement is 0.001 centimeters. Half of that is 0.0005 centimeters.

To find the lower real limit, subtract 0.0005 centimeters from the recorded value of 10.599 centimeters:

10.599 cm - 0.0005 cm = 10.5985 cm

So, the lower real limit of the bluebird's height would be 10.5985 centimeters.