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# 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. - CBSE Class 9 - Mathematics

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ConceptCollection of Data

#### 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.

#### Solution

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 mark of 200-224=(200+224)/2=424/2=212

Class mark of 225-249=(225+249)/2=474/2=237

Class mark of 250-274=(250+274)/2=524/2=262

Class mark of 300-324=(300+324)/2=624/2=312

Class mark of 325-349=(325+349)/2=674/2=337

Class mark of 350-374=(350+374)/2=724/2=362

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#### APPEARS IN

RD Sharma Solution for Mathematics for Class 9 by R D Sharma (2018-19 Session) (2018 to Current)
Chapter 22: Tabular Representation of Statistical Data
Ex.22.10 | Q: 12 | Page no. 17
Solution 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. Concept: Collection of Data.
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