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