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| 1. |
Ef=120 mean is 50 find F1 and F2 X 10 30 50 70 90 f 17 F1 32 F2 19 |
| Answer» GIVEN FREQUENCY =120⇒17+f1+32+f2+19=120⇒f1+f2=52Mean =∑fi∑xifi⇒mean =120(10×17)+(30×f1)+(50×32)+(72×f2)+(90×19)⇒mean =120170+30f1+1600+70f2+1710=50⇒3f1+7f2=252⇒3f1+7(52−f1)=252⇒f1=28⇒f2=24 | |