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They are the class boundaries.
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
THey are the number of observations whose value fall within the class boundaries.THey are the number of observations whose value fall within the class boundaries.THey are the number of observations whose value fall within the class boundaries.THey are the number of observations whose value fall within the class boundaries.
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.