Same mean, different spread — why we need measures of dispersionमाध्य एक, फैलाव अलग — प्रकीर्णन की मापों की ज़रूरत क्योंSame mean, different spread — why we need measures of dispersion

Sections 13.2–13.3 · Class 11 Maths Ch 13 · interactive diagram

Parts and what they mean

• Set A (समुच्चय A) — Values crowd close to 10 — low dispersion.
• Set B (समुच्चय B) — Values are scattered far from 10 — high dispersion.
• Same mean (समान माध्य) — Both sets have mean 60/6 = 10, so the mean alone cannot tell them apart.
• Range (परिसर) — Range = maximum − minimum: A has 12 − 8 = 4, B has 18 − 2 = 16. Mean deviation and standard deviation measure the spread using every value.

Original diagram drawn by Simple Learning Hub for NCERT Class 11 Maths Ch 13. Report a mistake