If the class intervals of a frequency distribution be $16 - 25, 26 - 35, 36 - 45, 46 - 55$ , then determine
(a) the class limits and class boundaries of the class $36 - 45$
(b) the class size and the class mark of the class interval $26 - 35$
(c) the class intervals when changed into overlapping class interval

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Solution

(a)
Lower class limit of the interval 36 - 45 = 36 and
Upper class limit of the interval 36 - 45 = 45
(b)
Class Size of the interval 26 - 35 = 10 and
Class Mark of the interval 26 - 35 = 30 (Class Mark is the average of the limits of the class interval)
(c)
The class intervals when changed into overlapping class intervals are
15.5 - 25.5
25.5 - 35.5
35.5 - 45.5
45.5 - 55.5

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If the class intervals of a frequency distribution be 16−25,26−35,36−45,46−55, then determine(a) the class limits and class boundaries of the class 36−45(b) the class size and the class mark of the class interval 26−35(c) the class intervals when changed into overlapping class interval