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In a frequency distribution, the mid values of a class is 10 and width of the class is 6. The lower limit of the class is

In Class XI of a certain school, there are 30 students in a Mathematics class and 20 students in Biolog class. Find the number of students which are in Mathematics class or in Biology class in the following cases: (i) Two classes are conducted at the same time. (ii) Two classes are condcuted at different time and 5 students study both the subject

The following bar graph shows the number of students in different classes of a school. How many more students are there in Class IX than in Class VIII ?

In a frequency distribution, the mid-value of a class is 15 and the class intervals is 4. The lower limit of the class is 10 (b) 12 (c) 13 (d) 14