Question

The mean of the following data is 21.6.find p.
Xi:6 12 18 24 30 36
Fi: 5 4 P 6 4 6

Answer 1

for this first multiply xi and fi and doing that you will get
6×5=30
12×4=48
18×p=18p
24×6=144
30×4=120
36×6=216
then add the products
⇒30+48+18p+144+120+216= 558+18p

⇒558+18p/126=21.6
558+18p = 2721.6
p=120.2

Answer 2

Mean = 18.75 ∑ y x N = 18.75 ∑yxN=18.75 7 p + 460 32 = 18.75 7p+46032=18.75 7p + 460 = 18.75 (32) 7p + 460 = 600 7p = 140 p = 20 Hence, the value of p is 20Read more on Sarthaks.com - https://www.sarthaks.com/1073565/if-the-mean-of-the-following-data-is-18-75-find-the-value-of-p-xi-10-15-p-25-30?show=1073576#a1073576