Question
A group of class IX students conducted a survey for the
number of family members in a household on 40 households in a locality, which resulted in the given frequency table. What is the mode of the data?Solution
To find the mode, we identify the modal class (class with the highest frequency). From the table: Highest frequency = 12 (for family size 6-8), so modal class = 6-8. Using the mode formula: 
where: 
Calculation: 
CONTINOUS variation occurs in a population due to:
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