Question

the mean of the following frequency distribution is 57.6 and the sum of the observation is 50 find the missing frequencies F1 and F2​

Answer 1

Answer:

sigma fi×xi =1560+50f1+90f2

mean=sigma fi×xi/sigmafi

57.6 =1560+50f1+90f2/50

1560+50f1+90f2=2880

50f1+90f2=-1320. --1

30+f1+f2=50

f1+f2=20

f1=20-f2. -2

50(20-f2)+90f2=-1320

1000-50f2+90f2=-1320

40f2=-2320

f2=-58

f1=20-f2

f1=78