Bunuel wrote:
The table above represents 100 people grouped by their blood types. The table also shows, for each blood type, the number of people who have a negative Rh factor (Rh-) and the number of people who have a positive Rh factor (Rh+). If 1 person is chosen at random from this group of 100 people, what is the probability that the person chosen has blood type AB or has a negative Rh factor?
A. 0.04
B. 0.19
C. 0.20
D. 0.21
E.0.99
Attachment:
2023-07-28_00-07-10.png
- Number of people having blood group AB =4
- Number of people who have a negative Rh factor (Rh-) =17
Total = 17 + 4 = 21
However, we have calculated people having blood group AB and those who have a negative Rh factor (Rh-) twice. Hence, we have to subtract the number of such individuals once.
21 - 1 = 20
Required Probability =\(\frac{20}{100} =0.20\)
OptionC
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Statistics : Posted by gmatophobia • on 16 Aug 2023, 09:00 • Replies 2 • Views 71