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SAI International School

Grade-VII

Mathematics

CHAPTER-3: DATA HANDLING,

LESSON NOTE-2

SUBTOPICS: Mean, Median and Mode

Mean: The mean is the average of the number of observations. To calculate mean we
have to divide the sum of the values of the observations by the total number of
observations.

for example: Find the mean of 12,14,14,20

60
Solution: 12+14+14+20 = = 15
4 4
Mode:

For a different type of requirements different central tendencies are used.

Mode tells us the number of observation which occurs more frequently.

The observation which occurs most of the time is called the Mode of that group.

Example

If we have the observation of average temperature in New Delhi for 12 months then find
the month in which it has the maximum average temperature? What is the mode of the
given observation?

Month Average Temperature
January 18
February 22
March 24
April 25
May 25
June 29
July 27
August 27