Answers

2015-01-10T22:55:54+05:30
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
0