| --- |
| 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. |
