( ) is a<x<b, ( ] is a<x<=b, [ ) is a<=x<b, [ ] is a<=x<=b. If there is no [ or solid bracket then there isn't a filled in dot, meaning that that number is not included. There is only a filled in dot when there is a solid bracket.
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The difference between any two consecutive lower (or upper) class limits it the class width.
Continuous refers to measurements that can take any value, possibly between two limits. Cumulative usually refers to a count "up to and including" the current value.
The distance between 67.8 and 70.8 on a box plot is known as the interquartile range (IQR). It is calculated as the difference between the third quartile (Q3) and the first quartile (Q1), which represent the limits of the box in the box plot.
In mathematical terms, mean is the average of all numbers, and rang is the difference of the highest and lowest numbers in the set. Control limits refers to the lines drawn on statistical charts.
It tells you the area of the function (curve) between the two limits.