class boundary is 48.6
class limit is either 48.1 or 49.1
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class boundary is 4.4 class limit is either 3.9 or 4.9
Let's say you're measuring a continuous variable such as height or speed. You collect tally charts with classes 30 - 39, 40 - 49, 50 - 59 etc. 49 would be an upper class limit, but 49.5 would be an upper class boundary, since a reading of 49.4 for example falls outside the class limits.
To calculate the class boundary of the first class in statistics, subtract 0.5 from the lower class limit of the first class and add 0.5 to the upper class limit of the first class. This is done to account for the fact that class boundaries fall halfway between the class limits.
-486 as a fraction is -486/1.
They are the class boundaries.