The AM and SD of the marks obtained in the subjects' Bengali, .English and History of 50 students',in a class are given below
Find the maximum and minimum variability of the subjects with respect to obtained marks.-

The marks obtained by 30 students in a examination of a class are given below . Find their average.

The arithmetic mean of the marks obtained in 8 different subjects in a school are given below. Find the average of the sum of the marks of 8 subjects.

The marks obtained in mathematics by 30 students of Class X of a certain scholl are given in table the below. Find the mean of the marks obtained by the students.

The marks obtained by 41 students in an examination in Math are given below: Find the average of the marks obtained by them.

The arithmetic means of the marks obtained by the students of a school in English and Bengali are 40.25 and 48.50 respectively . Find the averages of the sums of the marks obtained in English and Bengali.

The frequency distribution of marks in Mathematics obtained by 50 students in an examination is given below. Find mode.

Find the median and mode of the marks obtained by 30 students given in the question number 11 in exercise-1.

The frequency distribution of the marks obtained in a school is given below. In the table, the number of students who obtained marks from 31 to 40 , is unknown . But it is known that the average of total work obtained by the students is 42.85. Find the lost frequency.

The step frequency distribution table of the marks obtained by female students is given below. Calculate the mean marks.

The average marks obtained in an examination by two groups of student was found to 75 and 85 respectively. Determine the ratio of students in the two groups, if the average mark for all students was 80.