metadata
source: ncert
topic: statistics
class_level: class_6
chapter: ch9
difficulty: beginner
Class 6 | Ch9: Data Handling Mean = Sum/Count. Median = middle value when arranged in order. Odd count: middle term. Even count: average of two middle terms. Mode = most frequent value. Range = Max - Min. Bar graph: equal width bars, height=frequency. Tally: groups of 5. Probability: P(event)=favourable/total. Always between 0 and 1. Example: 12,15,11,18,15,13,20,15,10. Mean=129/9=14.33. Arranged→Median=15. Mode=15. P(even on die)=3/6=1/2. Must arrange data BEFORE finding median. Mode is most FREQUENT not largest.