KwickClips Artificial Intelligence · 39 sec · free
Two classes both average 5. Are they the same?
Short answer. No. Their spread differs.
What is SD?
The square root of variance.
Spread
| Class | Marks | SD |
|---|---|---|
| A | all 5s | 0 |
| B | 2 to 9 | 2 |
Remember
| SD is root of variance |
Two classes, both average five. Same? No. Standard deviation measures spread. Class A has all fives, so zero. Class B spreads from two to nine, so two. Standard deviation is the root of variance.
This clip is from the full lesson: Statistics for AI: Mean, Median, Mode, Variance and Standard Deviation — 7 minutes, with the tables, the quick answers and the whole lesson in text.
Useful for: CBSE Class 9 Artificial Intelligence (417), CBSE Class 9 Artificial Intelligence (417), CBSE Class 10 Artificial Intelligence (417), CBSE Class 11 Artificial Intelligence (843)
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