Class 7 · Chapter 3
Data Handling
Mean, median, mode; bar graphs; probability of an event.
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Detailed theory
Mean = sum ÷ count. Median = middle value (after sorting). Mode = most frequent value. All three describe a 'centre' but differ in sensitivity to outliers.
Key concepts & formulas
01
Mean .
02
Median is the middle value of sorted data.
03
Mode is the most frequent value.
04
Range max min.
05
Probability of event .