Question

ef=120 mean is 50 find F1 and F2 X 10 30 50 70 90 f 17 F1 32 F2 19​

Answer 1

Answer:

Given frequency =120

⇒17+f1+32+f2+19=120

⇒f1+f2=52

Mean =∑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