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Question

If the class intervals of a frequency distribution be 1625,2635,3645,4655, then determine
(a) the class limits and class boundaries of the class 3645
(b) the class size and the class mark of the class interval 2635
(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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