Statistics — Formula Sheet
Telangana Board · Class 9 · Mathematics
5 formulas from Statistics (Telangana Board Class 9 Mathematics) on one page, grouped by topic. Part of the Telangana Board Class 9 Mathematics syllabus.
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Formulas and Key Relations
Arithmetic Mean
For ungrouped data
Mean = Σx/n
For frequency distribution
Mean = Σfx/Σf
Median
For odd number of observations (n)
Median = ((n+1)/2)th observation
For even number of observations (n)
Median = average of (n/2)th and (n/2+1)th observations
Key relations
STEP-BY-STEP METHOD
1) Arrange data in ascending/descending order 2) If n is odd: Median = ((n+1)/2)
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Sources & Official References
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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