Reading 8: Probability Concepts - LOS d ～ Q1-3 class, style, events

mayanfang1

Q1. Let A and B be two mutually exclusive events with P(A) = 0.40 and P(B) = 0.20. Therefore:

A)   P(B|A) = 0.20.

B)   P(A and B) = 0.08.

C)   P(A and B) = 0.

Q2. For a given corporation, which of the following is an example of a conditional probability? The probability the corporation's:

A)   dividend increases given its earnings increase.

B)   earnings increase and dividend increases.

C)   inventory improves.

Q3. For an unconditional probability:

A)     there are at least two events.

B)     the addition rule is important.

C)     there is only one random variable of concern.

mayanfang1

答案和详解如下：

Q1. Let A and B be two mutually exclusive events with P(A) = 0.40 and P(B) = 0.20. Therefore:

A)   P(B|A) = 0.20.

B)   P(A and B) = 0.08.

C)   P(A and B) = 0.

Correct answer is C)         

If the two evens are mutually exclusive, the probability of both ocurring is zero.

Q2. For a given corporation, which of the following is an example of a conditional probability? The probability the corporation's:

A)   dividend increases given its earnings increase.

B)   earnings increase and dividend increases.

C)   inventory improves.

Correct answer is A)

A conditional probability involves two events. One of the events is a given, and the probability of the other event depends upon that given.

Q3. For an unconditional probability:

A)     there are at least two events.

B)     the addition rule is important.

C)     there is only one random variable of concern.

Correct answer is C)

An unconditional probability gives the probability of an event regardless of what other events occur.

gracesun

thank you so much

tofjing

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jacky_z

Thanks

zeraeh

看答案，谢谢LZ

saint_zhu

答案机。 。。

dullmul

answers

水上小又

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