14

Exam practices for Statics

Time: 45 Minutes                             Maximum Marks- 25

1.   Find the median of the following distribution: 2

Class Interval	Frequency
0-10	4
10-20	4
20-30	7
30-40	10
40-50	12
50-60	8
60-70	5
Total	50

2.   Find the mean of the following data: 2

Class	0-50	50-100	100-150	150-200	200-250
Frequency	15	20	35	20	10

3.   The mean of a distribution is 50. Determine value of ‘g’ 3

Class	0-20	20-40	40-60	60-80	80-100
Frequency	17	g	32	24	19

4.   Find the median of the following data: 2

Class interval	Frequency
0-10	5
10-20	8
20-30	23
30-40	17
40-50	7
50-60	8

5.   Find value of ‘q’ when mean is 47. 3

Class	0-20	20-40	40-60	60-80	80-100
Frequency	8	15	20	q	5

6.   The following table shows the ages of staff members in a office. 4

Age	18-27	27-36	36-45	45-54	54-63
Number of members	6	11	21	23	14

        Find mean and the mode

7.   Find the mean, mode and median of the following data: 6

Class	Frequency
0-20	12
20-40	13
40-60	6
60-80	7
80-100	8
100-120	14
120-140	13

8.   The median of the following data is 52.5. Find value of x and y if the final frequency is 100. 3

Class	Frequency
0-10	5
10-20	2
20-30	X
30-40	12
40-50	20
50-60	17
60-70	Y
70-80	7
80-90	9
90-100	4