The number of students absent in a class were recorded every day for 120 days and the information is given in the following frequency table: No. of students absent `(x)` : 0 1 2 3 4 5 6 7 No. of days `(f)` : 1 4 10 50 34 15 4 2 Find the mean number of students absent per day.

Following table shows the weight of 12 students: Weight (in kgs) 67 70 72 73 75 Number of Students: 4 3 2 2 1 Find the mean weight of the students.

The number of students in three classes are in the ratio 2 : 3:5. If 40 students are increased in each class, the ratio changes to 4:5:7. Originally, the total number of students was :

If 30 of the 36 students of a class were present on a certain day,what percentage of students were absent?

A class teacher has the following absentee record of 40 students of a class for the whole term.Find the mean number of days a student was absent.

Once upon a time in a school, 25 of a student were absent on a certain day if 720 students were present on that day what is the total number of student in a school

The table given below shows the number of students who were absent and percentage of students who were present in the given two examinations from five different schools. The table also shows the percentage of students who were present in the Biology and Physics examination respectively. The number of students who were present in Physics examination from school M is what per cent of number of students who were absent from schools M, L and O?

The ratio of the number of students of three class is 2:3:5 .If 20 students are added in each class then the ratio becomes 4:5:7 .Find the number of student in each class before adding .

The students in three classes are in the ratio of 2:3:4. If 40 students are added in each clas, the ratio becomes 4:5:6. Find the total number of students in all the three classes is :