Question

Use the following table to answer the question.
X A B C D
P(X) ? 0.20 0.22 0.28
Find P(A).

Answer 1

well first of you need to work out the ?

p(x) is the probability
they add up to 1
so add up 0.20 + 0.22 + 0.28 =0.7
1- 0.7=0.30
A's probability is 0.30

Answer 2

Thank you so much! I had no idea they added up to 1!

Answer 3

your welcome!