Question

Guys, can any one help in this problem

Answer 1

Step-by-step explanation:

sum of fi=3+f2+5+6+2

20=16+f2

f2=4

Mean=sum of xi*fi/sum of fi

therefore,

25.25=[12*3+18*f2+25*5+(f1+8)*6+40*2]/20

25.25=(36+18*4+125+6*f1+48+80)/20

25.25*20=36+72+125+6*f1+48+80

505=361+6*f1

6*f1=144

f1=24

Hope this helps you.