Question

find the mean of the following distribution:-
xi=10, 15, 20, 25, 30, 35, 40 and
fi= 4, 6, 8, 18, 6, 5, 3
​

Answer 1

Answer:

sum of xifi/ sum of fi

(10x4+15x6+20x8+25x18+30x6+35x5+40x3)/(4+6+8+18+6+5+3)

=(40+90+160+450+180+175+120)/(50)

=1215/50

=24.3