girlhooper4life11
15.08.2019 •
Mathematics
Ten people were asked if they have a brother or sister. this venn diagram shows the results. a person is randomly chosen from those shown in the venn diagram
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Ответ:
Option D
Step-by-step explanation:
Events are defined as follows.
Event A: The selected person has a sister
Event B: The selected person has a brother
The conditional probability of A given B is the probability that the selected person also has a sister since he has a brother.
This is:
We know that
P(B) is the probability that the selected person has a brother. Notice that there are 4 people who have a brother.
P(A and B) is the probability that the selected person has a brother and also a sister. Notice that there are 2 people who have a brother and a sister.
So
means that of the 4 people who have a brother, 2 of them also have a sister
Ответ:
(2a-2b)/(5a+5b)=2(a-b)/5(a+b)=2/5 *1/c=2/(5c)