Question

If the mean of the following data is 15, find the value of p.
x 5 10 15 20 25
f 6 p 6 10 5​

Answer 1

Step-by-step explanation:

Sum of fi= 6+p+6+10+5= 27+p

xifi= 30+10p+90+200+125

= 445+10p

Mean = sum of xifi/sum of fi

15= 445+10p/27+p

15(27+p)= 445+10p

27+p= 445+10p

p-10p= 445-27

-9p= 418

p=-418/9

p= 46.5(approx.)