Page 1 - Lesson Note MCT 2 56
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SAI INTERNATIONAL SCHOOL
ECONOMICS
Class-XI
CHAPTER 9
Measures of Central Tendency – Mode
(Lesson Note - 56)
TOPICS TO BE COVERED-
-Meaning of mode, Calculation of mode by the method of inspection.
-calculation of mode in case of individual, discrete and continuous series.
Meaning of mode: -Mode is the value occurring most frequently in a set of
observation and around which other items of the set cluster most density.
Calculation of mode in case of Individual Series: -
Mode by way of observation:
Step 1: Arrange the data in ascending or descending order.
Step 2: The item which occurs most in the series is ‘Mode’
Ex: From the heights of 15 students, calculate the value of mode.
Height (inches): 52, 50, 66, 70, 66, 72, 71, 66, 60, 67, 69, 67, 48, 60, 65.
Answer: -By arranging the series in an ascending order we get.
48, 50, 52, 60, 60, 65, 66, 66, 66, 67, 67, 69, 70, 71, 72.
By observation, height 66 inches occurs most; therefore the mode is 66
inches.
Mode by converting individual series into Discrete series: -
Ex: Calculate the value of mode from the data by converting the data into
discrete series:
Solution: -
