Q5 of 174 Page 608

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

Observations are = x, x + 2, x + 4, x + 6, x + 8

No. of observations = 5

Given mean = 11

⇒ 11 =

⇒ x + x + 2 + x + 4 + x + 6 + x + 8 = 11 × 5

⇒ 5x + 20 = 55

⇒ 5x = 55 – 20

x = = 7

So, value of x = 7.

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?

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

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.

The following table shows the number of students participating in the various games in a school:

Games	Cricket	Football	Basket ball	Tennis
No. Of students	27	36	18	12

Draw a bar graph to represent the above data.