The total sum in marks for 50 students in a class is 2250. Find the average marks in the class.

Salma bought 65 books for ₹ 1050 from one shop and 50 books for ₹ 1020 from another. What is the mean price she paid per book?

In a class of 40 students, ratio of boys and girls is 3:2 and the average marks scored by boys is 42 and that by girls is 46. Then the average marks scored by the whole class is :

Find the mean of 12, 15, 7, 8 and 'x + 13', if x = 2

The marks out of 50 obtained by 100 students in a test are given below as:

Find the value of the (3 mode - 2 median).

2, 4, 5, 2, 4, 8, 2, 4, 7, 8, 12, 4,

The mode of given data is:

Thirty six students of class IX contributed on an average Rs 42 towards flood relief fund whereas some students of class X contributed on an average Rs 54.50. If the overall average contribution per student remained Rs 47, then how many students of class X contributed ?