Why are unequal class intervals sometimes used in a frequency distribution?

Answer

Frequency distribution is used to analyze a large Set of data in Statistics. This method is used since it is more illustrative and simplified. At times, unequal class intervals is used because each side of parameter is particularly small.
Reference:
Q&A Related to "Why are unequal class intervals sometimes used..."
Usually because the frequencies at one or both ends of the distribution are very small.
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It usually has no effect upon the calculation of the quantiles and in particular the median value of the variate. Avoid open-ended classes if possible. report this answer. Updated
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In statistics Help , frequency distribution , When we want the variability of two series, we need to have a measure which is independent of the units used , which may be different
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The most important thing in creating intervals for a frequency distribution is that the intervals used must be non-overlapping and contain all of the possible observations. They are
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