the class mark of distribution are 5,10,15,20,25,30,35 and the class size is=
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Class marks are: 15,20,25,...
Lower limit of class 20 is mean of 15 and 20=215+20=17.5
Upper limit of class 20 is the mean of 20 and 25=220+25=22.5
20 is the class mark for the class interval 17.5−22.5
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17.5 - 22.5
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