The class interval for each interval is the difference between its upper limit and its lower limit.
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The class interval is the maximum possible value in the class less the maximum possible value in the class below. The second is equivalent to the minimum possible value in the class.
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basically this is an exampleAGE (YEARS) FREQUENCY FREQUENCY DENSITYFD= Frequency DensityAge : 0
In general, the confidence interval (CI) is reduced as the sample size is increased. See related link.