Concept explainers
(a)
To find: The probability of Karla and Juan ask him.
(a)
Answer to Problem 15WE
The probability of the given event is
Explanation of Solution
Given information:
The given information is Karla will ask Frank to be her tennis partner is
Calculation:
The given events are independent. We know that two events
The probability of each girl asking the boy is given. Thus, the probability of both the girls asking is
Therefore, the probability of the given event is
(b)
To find:The probability of Roger and Juan ask him but Karla doesn’t.
(b)
Answer to Problem 15WE
The probability of the given event is
Explanation of Solution
Given information:
The given information is Karla will ask Frank to be her tennis partner is
Calculation:
The probability of the second girl and the third gin asking and the first girl not asking is given
Therefore, the probability is
(c)
To find: The probability ofat least two of the three ask him.
(c)
Answer to Problem 15WE
The probability of the given event is
Explanation of Solution
Given information:
The given information is Karla will ask Frank to be her tennis partner is
Calculation:
The probability of at least two girls asking the boy includes the probability of any two girls asking and the probability of all the three girls asking First, find the probability of first two girls asking
Similarly, we get the probability of last two girls asking as
Now, find the probability when all the three girls ask the boy.
Add all the probabilities to find the probability of at least two girls asking the boy
Therefore, the probability is
(d)
To find: The probability of at least one of the three ask him.
(d)
Answer to Problem 15WE
The probability of the given event is
Explanation of Solution
Given information:
The given information is Karla will ask Frank to be her tennis partner is
Calculation:
The probability that at least one of the girls asks the boy is the same as the complement of the probability that none of the girls ask the boy.
The probability of least one of the girls asking the boys is
Therefore, the probability is
Chapter 15 Solutions
Algebra and Trigonometry: Structure and Method, Book 2
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