Measures of Central Tendency
ICSE · Class 10 · Mathematics
Quick revision notes for Measures of Central Tendency — ICSE Class 10 Mathematics. Key concepts, formulas, and definitions for last-minute revision.
Key Topics to Revise
Mean (Arithmetic Mean)
- Mean is the most commonly used measure of central tendency
- It is calculated by dividing the sum of all observations by the number of observations
- Mean can be calculated for both ungrouped and grouped data
Median
- Median is the middle value when data is arranged in ascending or descending order
- It divides the data into two equal halves
- Median is not affected by extreme values
Mode
- Mode is the value that appears most frequently in the data
- A dataset can have no mode, one mode, or multiple modes
- Mode can be determined from frequency distribution or histogram
Quartiles and Graphical Methods
- Quartiles divide data into four equal parts
- Q₁ (Lower Quartile) = 25th percentile, Q₂ (Median) = 50th percentile, Q₃ (Upper Quartile) = 75th percentile
- Inter-quartile Range (IQR) = Q₃ - Q₁
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