The most frequently occurring observation is called ________________.

Median divides the total frequency into _________________ equal parts.

The sum of 12 observations is 600, then the mean value is ________________.

The arithmetic mean of first ten natural numbers is _______________

Illustration:   The marks obtained by 30 students of Class X of a certain school in a Mathematics paper consisting of 100 marks are presented in table below. Find the mean of the marks obtained by the students.

Marks obtained	10	20	36	40	50	56	60	70	72	80	88	92	95
Numbers of student	1	1	3	4	3	2	4	4	1	1	2	3	1

The mean of the data : 9, 7, 11, 13, 2, 4, 5, 5 is _______________

The mean of 8, 11, 6, 14, x and 13 is 16. Find the value of the observation x.

The mean of the data: 2.2, 10.2, 14.7, 5.9, 4.9, 11.1, 10.5 is ______________.

The mean of 6, 8, x + 2, 10, 2x - 1, and 2 is 9. Find the value of x

The mean of five numbers is 27. If one of the numbers is excluded the mean gets reduced by 2. The excluded number is ___________