metadata
source: ncert
topic: statistics
class_level: class_7
chapter: ch3
difficulty: beginner
Class 7 | Ch3: Data Handling Mean=Sum/n. Mean of first n natural numbers=(n+1)/2. Median: arrange in order. Odd: middle term. Even: average of two middle terms. Mode: most frequent. Range=Max-Min. Double bar graph: compares two datasets side by side. Probability: P(event)=favourable/total. Between 0 and 1. Example: 4,7,2,9,4,8,4,6. Mean=44/8=5.5. Arranged:2,4,4,4,6,7,8,9. Median=(4+6)/2=5. Mode=4. P(even on die)=3/6=1/2 (even numbers: 2,4,6). Always arrange data BEFORE median. Probability never exceeds 1.