Data Jaasoos
Class 7 Maths · Chapter 13: Binduon ko Jodna… · NCERT Ganita Prakash section P2 5.4
Seekho
Achchhe se sajaa data kahaniyan sunaata aur rahasya uthaata hai. Do schoolon ki lambaai ke dot plot dikhaate hain ki ek school ki Class 6 se 8 ausatan kaafi lambi hai. Kyun? School kahan hain? Do school ka data saare bachchon ke baare mein kuch kehne ko kaafi nahi.
Bharat mein 1989 se 2019 tak ausat lambaai ki survey table se daave jaanch sakte hain. Sahi: "13 saal ke ladkon ki ausat lambaai 144 se 148 cm badhi." Sahi nahi: "13 saal ki saari ladkiyan saare 11 saal walon se lambi": ausat samooh batata hai, har vyakti nahi.
Rujhaan dekho: ladkiyon ki ausat lambaai 10–12 saal ke aas-paas sabse tez badhi, ladkon ki 12–14. Zoomed axis (0 ki jagah 145 cm se) chhote antar saaf dikhaata hai, par scale dhyaan se padho taaki antar badha-chadha kar na dikhe.
Mean faisla? Parivaar ki ausat lambaai jitna darwaza banaane par sabse lamba sar takraayega! Sahi saar (mean, median, sabse zyaada) us sawaal par nirbhar hai jiska jawaab de rahe ho.
Explore: saabit ya nahi?
- Lambaai survey ke daave sort karo.
Yaad rakho
- Daave data se saabit karo; ausat samooh batata hai, har vyakti nahi.
- Sawaal ke hisaab se saar chuno: mean, median ya chhor ka maan.
Quick check
Parivaar ke liye darwaze ki oonchaai: kaunsa saar tay kare?
- sabse lambe ki lambaai (thoda zyaada)
- mean lambaai
- median lambaai
- sabse chhoti lambaai
Answer
sabse lambe ki lambaai (thoda zyaada). Sabko aana chahiye, to yahan sabse zyaada maayne rakhta hai, beech nahi.
Socho
17 bachchon ki lambaai di hai. Teacher unhe chhote aur lambe ke do barabar groups mein kaise baante?
Ek answer
Lambaai kram mein lagaakar median (9va maan) nikaalo. Usse neeche ke 8 ek group aur upar ke 8 doosra; median wala kisi mein bhi (ya 16 ko 8–8).
Practice
Teen levels (easy, medium, hard) ke naye sawaalon se practice karo, kuch hands-on, hints aur hal ke saath. Topic poora karne ke liye pichhle 5 mein se 4 sahi karo.