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If the mean marks of mathematics of n, students is `barx_1` and that of `n_2` students is `barx_2`, then the mean marks of total students is_____.

Marks of students in a test is

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.

Fill in the blanks If the mean of n numbers x_1,x_2,x_3,….,x_n is barx then the mean of kx_1,kx_2,kx_3,…,kx_n is______.

There are 25 boy students and 20 girls students in a school. The average of marks in math of 25 boy students is 52 and the average of marks in math of 20 girl-students is 48. Find the average of marks obtained by the students of the school as a whole.

Fill in the blanks If (sumx_i)/n= barx then (sum(x_i-a))/n -_______.

Calculate the mean of obtained marks of 64 students from the given data.

If the mean of the set of numbers x_1,x_2, x_3, ..., x_n is barx, then the mean of the numbers x_i+2i, 1 lt= i lt= n is

Mean of the getting mathematics number of 70 students is 45. If SD is. 18, then find the co-efficient of variation

Find the mode of the following frequency distribution of obtained marks of 22 students.

The arithmetic mean of 1, 2, 3, ……., n is___