Arre, grouped data ka median cumulative frequency aur n/2 se nikalte hain. Pehle cumulative frequency column banayein, phir n/2 dekhein ki kaunsi class mein aata hai, usi se median class pata chal jaati hai. Us class mein formula lagake median nikaal lein.
Maine ye promotion ke exam mein nahi seekha tha, bas assumed mean se kaam chala liya... par vahan ek question isi method ka aaya tha aur main chook gaya.
Aaj bhi yaad aata hai ki meri posting nahi badh paayi, sirf isi median ke chakkar mein.
#exams#study
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