1.

Find arithmetic mean in the followingClass-interval Frequency80-5050 10015100 15032150- 200200 250250 3002612.7

Answer»

Taking the middle of the class we get

(25*10+75*15+125*30+175*35+225*25+275*15)/(10+15+30+35+25+15)

= 21000/(130) = 161.53



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