Page 1 - Lesson Note MCT 2 53
P. 1
SAI INTERNATIONAL SCHOOL
ECONOMICS
Class-XI
CHAPTER 9
Measures of Central Tendency – Median and Mode
(Lesson Note - 53)
TOPICS TO BE COVERED-
- calculate median in special cases of continuous series.
-Problems on less than cumulative frequency distribution.
-Problems on more than cumulative frequency distribution.
-Problems on mid-valued series.
Calculation of median in a cumulative series: -
When the data is given in the form of “less than” or “more than” for all
items in the series, such data has to be converted into a simple frequency
distribution in order to find the frequency of the median class.
Ex: - Calculate median from the following data.
Marks Frequency
Less than 10 5
Less than 20 20
Less than 30 45
Less than 40 80
Less than 50 100
Less than 60 115
Less than 70 125
