A computer consulting firm presently has bids out on three projects. Let Ai = {awarded project i}, for i = 1, 2, 3, and suppose that P(A1) = .22, P(A2) = .25, P(A3) = .28, P(A1 ∩ A2) = .11, P(A1 ∩ A3) = .05, P(A2 ∩ A3) = .07, P(A1 ∩ A2 ∩ A3) = .01. Express in words each of the following events, and compute the probability of each
- a. A1 ∪ A2
- b. A1′∩ A2′ [Hint: (A1 ∪ A2)′ = A′1 ∩ A′2]
- c. A1 ∪ A2 ∪ A3
- d. A′1 ∩ A′2 ∩ A′3
- e. A′1 ∩ A′2 ∩ A3
- f. (A′1 ∩ A′2 ) ∪ A3
a.
Compute
Answer to Problem 13E
The probability of an event
Explanation of Solution
Given info:
The data represents the projects of the consulting firm.
Here, A1 be awarded project 1,
A2 be awarded project 2,
A3 be awarded project .
Let
Calculation:
Addition rule:
For any two events A and B,
Complement:
The complement of the event A contains the set of all element that are contained in sample space S and not contained in event A. it is denoted as
Union:
The union of two events A1 or A2 contains set of all elements which are either in A1, A2, or both the events. It is denoted by
Intersection:
The intersection of two event A1 and A2 contains set all of element which are in both A1 and A2. It is denoted by
The probability of A1 or A2 can be obtained as
Thus, the probability of an event
b.
Compute
Answer to Problem 13E
The probability of an event
Explanation of Solution
Calculation:
The probability of
The event
Thus, the probability of an event
c.
Compute
Answer to Problem 13E
The probability of an event
Explanation of Solution
Calculation:
Addition rule:
For any three events A, B and C ,
The event
The probability of
Thus, the probability of an event
d.
Compute
Answer to Problem 13E
The probability of an event
Explanation of Solution
Calculation:
The event
The probability of
Thus, the probability of an event
e.
Compute
Answer to Problem 13E
The probability of an event
Explanation of Solution
Calculation:
The event
The event
From the Venn diagram, the probability of
Thus, the probability of an event
f.
Compute
Answer to Problem 13E
The probability of an event
Explanation of Solution
Calculation:
The event
The event
The probability of
Thus, the probability of an event
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Chapter 2 Solutions
Probability and Stats. for Engineering.. (Looseleaf)
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