What is the class size of the class interval 12.5 - 17.5 ?
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Class mark =2 lower limit+upper limit
Thus, lower limit + upper limit =35 ....(1)
and Class interval = upper limit − lower limit
Thus, upper limit − lower limit =5 .....(2)
Adding (1) and (2), we get
2 (upper limit) =40
Upper limit =20
Hence, lower limit =15
Thus, class interval is 15−20.
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