what are the main points underlying the construction of frequency distribution

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(i) All class intervals should be of equal size
(ii) The lower limit of the first class should either be 0.5 or multiple of 5.
(iii) We should avoid odd sized class interval
(iv) Open-end classes should be avoided
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Frequency distribution is that series in which items cannot be exactly measured.The items assume a range of values and are placed within a range of limits. (1)Size of the Class Interval (2)Number of Classes (3)Equal and unequal Class Intervals (4)Determination of Class Limits (5)Finding the frequency for each class
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