Best of 5 Subjects Class 10

The width of each of five continuous classes in a frequency distribution is 5 and the lower class limit of the lowest class is 10. The upper class limit of the highest class is

In class 12 there are 8 students. In class 11 there are 6 students .In class 10 there are 5 students . Total ways of selecting 10 students , such that there are at least 2 students from each class and at most 5 students from 11 students of Class 10 and 11 combined is 100k. Then find value of k

If the average marks of the 1/4th class is 85% and that of 1/3rd class is 70% and the average marks of the rest class is 56% then the average of the whole class is (for the given subjects):

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Find class widht of class 10.5 to 15.5

The class width and class mark of the class 10.5-12.5 are _______and______respectively.