Statistics class help??

Question

Summarization of blood groups and Rh types for 100 typical people:
GROUP
-------------------------------------------
-------------- O ---- A - B ---AB
TYPE Rh+ 39 ---35--8 ---- 4
-------- Rh- 6 ---- 5 --2---- 1
----------------------------------------------

1.If one person is randomly selected find the probability of getting someone who is group A or type Rh-?
2. If one person is randomly selected, find the probability of getting someone who is grp. A or grp.B?
3. If one person is randomly selected, find P(not type Rh+)
4.If one person is randomly selected, find P(grp. B or type Rh+)
5.If one person is randomly selected find P(grp AB or type Rh+)
6.If one person is randomly selected, find P(grp. A or O or type Rh+).

I need help with these, been givin me trouble. I need to know how to do these problems. Please help! The table above is what was in the book with the problems.

Answer 1

First, look at the total population: 39+35+8+4= 96 Rh+
6+ 5+ 2+1=14 Rh-
Tot. Pop. = 110
1) There are 40 ways to get type A and 9 more ways to get Rh-
P (A or Rh-) = 49/110
2) P(A) = 40/110; P(B) = 10/110. So, P(A or B) = 50 / 110

etc.!