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.
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The difference between any two consecutive lower (or upper) class limits it the class width.
class boundary is 48.6 class limit is either 48.1 or 49.1
class boundary is 4.4 class limit is either 3.9 or 4.9
Oh, dude, class intervals are the ranges that group data together in a frequency distribution, like 1-10, 11-20, etc. Class width is just the difference between the upper and lower boundaries of each class interval. So, basically, class intervals are like the neighborhoods where data hangs out, and class width is just the size of the houses in those neighborhoods.
class limits is where the numbers are fall.from begining to end.a class interval is when a fixed no. are decided for eg.0-5,5-10,10-15,15-20 are inclusive class intervals.