Data ka Chitran

Class 7 Maths · Chapter 13: Binduon ko Jodna… · NCERT Ganita Prakash section P2 5.3

Seekho

Chitra data samajhna aasaan karte hain. Do shehron mein tamaatar ke maasik daam milaane ke liye har mahine ke do bar agal-bagal do rangon mein banao: clustered (double) bar graph. Bar ke andar ke pattern ya dot rang na pehchaan paane walon ki madad karte hain.

Kadam 1: jo diya hai pehchaano. Graph kaise sajaa hai (har line par kya)? Scale kya hai (yahan 1 unit = 10)? Kaunse pattern dikhte hain (saal bhar daam badhte hain)?

Kadam 2: nishkarsh. Har avlokan samjho: Town P Jan, Feb, Apr aur Jun mein mehnga; Town Q Mar aur May mein. Sirf wahi daave karo jo data saabit kare: graph kyun ya doosre shehron ke baare mein kuch nahi kehta. Do shehron ke din ke ujaale ka graph, ek June tak badhta aur ek ghatta, batata hai ki ve ulte golaardhon mein hain.

Graph har jagah: do cricket teamon ke prati over run, alag space agencies ke saal-dar-saal rocket launch, jaanvaron ki gati. Pehle sheershak, label, scale aur key padho; phir tulna karo, kul ya ausat nikaalo, aur "har saal badhta" jaise rujhaan dekho.

Explore: bar graph banao.

1. Vote: Cricket 35, Chess 15, Kabaddi 25, Hockey 10. Har bar set karo.

Yaad rakho

• Double bar graph har shreni ke do bar agal-bagal rakhkar do samoohon ki tulna karta hai.
• Graph do kadam mein padho: diya pehchaano, phir sirf samarthit nishkarsh.

Quick check

1 unit = 5 run scale wale double bar graph mein bar 3 unit tak hai. Kitne run?

1. 15
2. 3
3. 8
4. 5

Socho

City 1 mein June mein lagbhag 18 ghante ujaala; City 2 mein tab sabse kam. Isse kya pata chalta hai?

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.