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16 Aug 2023, 09:00
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C
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74% (01:09) correct
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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
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2023-07-28_00-07-10.png [ 18.05 KiB | Viewed 34397 times ]
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16 Aug 2023, 10:09
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It is important to note that there's an over lap between the sets. We do have one person with group AB & negative Rh factor.
For Probability(AB) or Probability(-Rh) = P(AB) + P(-Rh) - P(AB & -Rh) =\( \frac{17+ 4 -1}{100 }\) = 0.2
For Probability(AB) or Probability(-Rh) = P(AB) + P(-Rh) - P(AB & -Rh) =\( \frac{17+ 4 -1}{100 }\) = 0.2
16 Aug 2023, 12:39
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Bunuel
- 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 = \(\frac{20}{100} = 0.20\)
Option C
