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If it is a discrete variable, then 31 - 25 = 6
If it is continuous then 31.5 - 24.5 = 7
The class interval for each interval is the difference between its upper limit and its lower limit.
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.
Accidentals DON'T alter the numeric size of intervals.
The linear function changes by an amount which is directly proportional to the size of the interval. The exponential changes by an amount which is proportional to the area underneath the curve. In the latter case, the change is approximately equal to the size of the interval multiplied by the average value of the function over the interval.