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| 1. |
In a grouped frequency distribution, the class mark of a class a – 27 is given by 22.5. Find the value of a. |
| Answer» ARKS are: 15,20,25,...LOWER LIMIT of class 20 is mean of 15 and 20=215+20=17.5Upper limit of class 20 is the mean of 20 and 25=220+25=22.520 is the class MARK for the class interval 17.5−22.5 | |