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.

Given, Class size = 25


First class interval = 200-224


(i) Seven class intervals are: 200-240, 225-249, 250-274, 275-299, 300-324, 325-349, 350-374


(ii) Class marks of 200-224: = = 212


Class marks of 225-249 = = = 237


Class marks of 250-274 = = = 262


Class marks of 275-299 = = = 287


Class marks of 300-324 = = = 312


Class marks of 325-349 = = = 337


Class marks of 350-374 = = = 362


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