Q4 of 174 Page 608

What is the class mark of class 21-30 in the table of Q.3 ?

Class Interval = 21 – 30 (given)

Upper class limit = 30

Lower class limit = 21

Class marks = 1/2 [upper limit + lower limit]

Class marks = 1/2 [30 + 21]

∴ Class marks = 51/ 2 = 25.5

Look at the table given below:

Marks	0-10	10-20	20-30	30-40
No. Of students	8	11	7	3

The true upper limit of the class 10-20 is

Look at the table given below:

Marks	0-10	11-20	21-30	31-40
No. Of students	6	9	11	4

What is the class size of the class 11-20 in this table?

If the mean of five observations x, x + 2, x + 4, x + 6 and x + 8 is 11, find the value of x.

The points scored by a kabaddi team in a series of matches are as follows:

8, 24, 10, 14, 5, 15, 7, 2, 17, 27, 10, 7, 48, 8, 18, 28

Find the median of the points scored by a team.