SOLUTION: Blood types and Rh factors: In addition to being grouped into four types, human blood is grouped by its Rhesus (Rh) factor. Consider the figures below which show the distributions

Algebra ->  Test -> SOLUTION: Blood types and Rh factors: In addition to being grouped into four types, human blood is grouped by its Rhesus (Rh) factor. Consider the figures below which show the distributions       Log On


   

Question 785594: Blood types and Rh factors: In addition to being grouped into four types, human blood is grouped by its Rhesus (Rh) factor. Consider the figures below which show the distributions of these groups for Americans.
O. A. B. AB
Rh+ 37% 34% 10%. 4%
Rh- 6% 6%. 2%. 1%
Choose 1 American at random. Find the pribability that the person
D. Has Rh- given that the person has type B.
Answer in text is .1667. PLEASE HELP!!!!!! I'M PANICING ABOUT THESE WORD PROBLEMS! Thanks so much!
Answer by KMST(5328) About Me  (Show Source):
You can put this solution on YOUR website!
The table tells you that 10% of Americans are type B with Rh+, and 2% are B with Rh-.
That adds to 12% of Americans that have type B blood.
The others are O, A or AB.
For every 100 Americans, you find (on average) 12 with type B, but of those 12, only 2 are Rh-.
So 2%2F12=1%2F6 of the type B AMericans will be Rh-
2%2F12=1%2F6=%221.6666666....%22 and if you round to 4 decimal places that gives you the probability that an American that you know has type B would be Rh- as 0.1667 or 16.67%.