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Class 10th
Chapter - Statistics
Board - CBSE
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Evaluation of Median
Here,
- l denotes lower limit of median class
- h denotes width of median class
- f denotes frequency of median class
- cf denotes cumulative frequency of the class preceding the median class
- N denotes sum of frequency
we know that N = 22 and N/2 = 11
The cumulative frequency just greater than 11 is 14 and the corresponding class is 20-30
According to the question,
Median class is 20-30
So,
l = 20, h = 10, f = 9, cf = cf of preceding class = 5 and N/2 = 11
By substituting all the given values in the formula,
Evaluation of Mode
Formula for mode:
Where,
l is lower limit of modal class.
Here,
According to the question,
Modal class is 20 - 30.
Evaluation of Mean
Therefore, mean is given by
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