Answer:
I don't know that account but if you like we can be friends starting now?? :D
Step-by-step explanation:
Batch size = 280 purifiers
Defectives = 12 purifiers
Then,
P(defective) = defectives/batch size = 12/280 =3/70
As a percentage:
P(defective) = (3/70)*100 = 4.29%
Must be point E as that is the only one between 1 and 2, like 1.6
Base B (aka p) is equivalent to 18
p=18