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Define: class-interval...

Define:
class-interval

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Define: class-length

Given that the cumulative frequencies of less than type and more than type corresponding to a class interval are 320 and 323 respectively, when the total frequency is 500, find the percentage of the class-interval.

The mid-value of a class-interval of a frequency distribution is x and its lower -boundary is y. Then its upper -boundary=

The mid-value of a class-interval of a frequency distribution is 10 and the class-length of each class is 6, The lower class limit of the class-interval is

The mid-value of a class-interval of a continuous frequency distribution is 42 and its class-length is 10.Find the lower and upper class-limits of the class-intervals.

The class-length of the class-intervals 1-4,5-8,………is

The class-mark and class-length of a class-interval are 22 and 10 respectively.Find its lower and upper class-boundaries.

What do you mean by class-frequency ? What is relative class-frequency of any class-interval?

Determine the third class-interval of the classes 10-19,20-29,……………and find its lower and upper class-boundaries.

The mid-values of the class-intervals of a frequency distribution are respectively 11,14,17,20…… The class interval of which the mid-value is 17 is