Question

The mean of the following data is 21.6. Find the value of p.

xi 6 12 18 24 30 36

fi 5 4 p 6 4 6​

Answer 1

Answer:

5

Step-by-step explanation:

Mean = 21.6 = Sum(xifi)/Sum(fi) = {(6*5)+(12*4)+(18*p)+(24*6)+(30*4)+(36*6)}/(5+4+p+6+4+6)

21.6 = (558+18p)/(25+p)

21.6(25+p)= (558+18p)

540+21.6p = 558+18p

3.6p = 18

p = 18/3.6

p = 5