What is frequency , class interval , class mark .

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Solution

Frequency
Frequency is the number of times a particular observation occurs in data.
Class Interval
Data can be grouped into class intervals such that all observations in that range belong to that class.
Class width = upper class limit - lower class limit.
Class Mark
Class mark, in statistics, is the average of the upper limit and the lower limit of a class in a frequency distribution. In other words, the class mark is the mid-value of the given class interval.
Class mark $= \frac{Upper limit + Lower Limit}{2}$

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Similar questions

Q. In a histogram the area of each rectangle is proportional to

(a) the class mark of the corresponding class interval

(b) the class size of the corresponding class interval

(c) frequency of the corresponding class interval

(d) cumulative frequency of the corresponding class interval

Explain the meaning of each of the following terms.
(i) Variate
(ii) Class interval
(iii) Class size
(iv) Class mark
(v) Class limint
(vi) True class limits
(vii) Frequency of a class
(viii) Cumulative frequency of a class

define frequency, frequency distribution, cumulative frequency distribution, true upper and lower limits, class size of class interval,class mark of class interval, range

The frequency polygon of a frequency distribution is shown below.

Answer the following about the distribution from the histogram.

(i) What is the frequency of the class interval whose class mark is 15?

(ii) What is the class interval whose class mark is 45?

(iii) Construct a frequency table for the distribution.

Q. Marks of the 100 students are distributed in the grouped frequency distribution table.

Class marks (Marks)	150	160	170	180	190	200
No. of Students	23	14	16	11	21	15

What is the class interval for the group having frequency 11 ?

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