Calculate average number of marks by student in a class.

Note: It is inclusive class case with lower limit of the first class is zero.

Write the upper class limit and the lower class limit of the class 20 - 30.

Write the upper class limit and the lower class limit of the class 25-35.

Write the upper classs limit and the lower class limit of the class 35-40.

The average marks of 48 students in a class is 45. the average marks of the boys in the class is 40 and average marks of the girls in the class is 50. what is the ratio between the numbers of boys and the number of girls in the class ?

The middle point of a class is 10 and the length of each class is 12 , then calculate the lower limit of the class of the class interval.

Direction: There are 1250 total students in 5 different classes in a school. The number of students in class I is 50 less than the number of students in class II. The number of class IV students is 50 more than the number of students in class II. The average number of students in class III and class V is 250. The number of students in class III is 10% less than the number of students in class I. The average number of students of class II and class III is

Direction: There are 1250 total students in 5 different classes in a school. The number of students in class I is 50 less than the number of students in class II. The number of class IV students is 50 more than the number of students in class II. The average number of students in class III and class V is 250. The number of students in class III is 10% less than the number of students in class I. The ratio of the total number of students of class V to the total number of students of class III is

Direction: There are 1250 total students in 5 different classes in a school. The number of students in class I is 50 less than the number of students in class II. The number of class IV students is 50 more than the number of students in class II. The average number of students in class III and class V is 250. The number of students in class III is 10% less than the number of students in class I. The total number of students of class IV and the number of students of class II is