INDIAN SCHOOL MUSCAT DEPARTMENT OF COMMERCE AND HUMANITIES Statistics for Economics Class : 11
Reference: NCERT text book Date of submission ------------------2017
Worksheet on Median and Quartiles
Date of issue --------------2017
Economics (030)
1. Define median. 2. Mention the formula for calculation of median in ungrouped data, grouped data of discrete and class individual series. 3. What are quartiles? 4. What is the difference between median and arithmetic mean? 5. Which quartile is called median? 6. Define lower quartile. 7. Define upper quartile. 8. State any two merits and two demerits of median Numerical Questions:1. Calculate median, first quartile and third quartile from the following. 18, 20, 25, 17, 9, 11, 23, 37, 38, 42, 36, 35, 8, 6, 11, 21, 20, 41, 35 2. Calculate median, first quartile and third quartile from the following. Size Frequency
4 3
8 6
12 8
16 10
20 9
24 2
28 1
3. Calculate median, first quartile and third quartile from the following. Class Frequency
5 – 15 8
15 – 25 12
25 – 35 15
35 – 45 9
45 – 55 6
4. Calculate median, first quartile and third quartile from the following. Marks less than Number of students
10
20
30
40
50
60
70
80
15
35
60
84
96
127
198
250
5. Calculate median, first quartile and third quartile from the following. Marks more than Frequency
10
20
30
40
50
60
50
46
40
30
18
7
6. Locate median on a graph and verify the result Class frequency
0–5 7
5 – 10 10
10 – 15 20
15 – 20 13
20 – 25 17
25 – 30 10
30 – 35 14
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