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Question

The class size of a distribution is 25 and the first class- interval is 200- 224. There are seven class - intervals.
(i) Write the class - intervals.
(ii) Write the class - marks of each interval.

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Solution

Class size = 25
First class is 200 - 224
Number of class = 7
Class interval will be

(i)200224,225249,250274,275299,300324,325349,350374(ii)Class marks of 200224=200+2242=4242=212Class mark of 225249=225+2492=4742=237Class mark of 250274=250+2742=5242=262Class mark of 275299275+2992=5742=287Class mark of 300324=300+3242=6242=312Classmarkof325349=325+3492=6742=337and class mark of 350374=350+3742=7242=362


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