please solve question number 12
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mean =x1fi
---
n
= 10×17+30×f1+50×32+70×f2+90×19
--------–-------------------
120
50=170+30f1+1600+70f2+1780
----------------------------
120
6000=3550+30f1+70f.
30f1+70f2 =2540
3f1+7f2 =254
---
n
= 10×17+30×f1+50×32+70×f2+90×19
--------–-------------------
120
50=170+30f1+1600+70f2+1780
----------------------------
120
6000=3550+30f1+70f.
30f1+70f2 =2540
3f1+7f2 =254
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