Question

if the mean of the following frequency distribution is 40.4 then find the missing frequencies


xi= 0. 1. 2 3. 4. 5. total
fi= 46. x. y. 25. 10. 5. 200​

Answer 1

fixi=0+x+2y+75+40+25

=X+2Y+140

X+2Y=-140

total fi=200

mean=fixi/total fi

40.4=X+2Y+140/200

40.4×200=X+2Y+140

8080-140=X+2Y

7940=X+2Y

46+X+Y+25+10+5=200

86+X+Y=200

X+Y=114

Subtracting

X+Y=114

-

X+2Y=7940

---------------------------

- - -

----------------------------

-Y=-7826

Y=7826 ITS WRONG THEN ALSO I TRIED