1.

3.Find arithmetic mean in the following:Class-interval Frequency0 5050-100100 150150- 200200 250250 300101530352515

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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