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Conditional Probability and Probability Chains Quiz

#1

What is conditional probability?

The probability of an event occurring given that another event has already occurred
Explanation

Conditional probability is the likelihood of an event happening based on the occurrence of another event.

#2

In probability, what does P(A and B) represent?

The intersection of events A and B
Explanation

P(A and B) represents the probability of both events A and B occurring together.

#3

What is the formula for conditional probability P(A | B)?

P(A and B) / P(B)
Explanation

Conditional probability P(A | B) is calculated by dividing the probability of both events A and B occurring by the probability of event B.

#4

If events A and B are independent, what is P(A and B)?

P(A) * P(B)
Explanation

For independent events A and B, the probability of both events occurring is the product of their individual probabilities.

#5

If events A and B are mutually exclusive, what is P(A and B)?

0
Explanation

Mutually exclusive events cannot occur together, so the probability of both happening simultaneously is 0.

#6

What is the complement of an event in probability?

The probability of the event not occurring
Explanation

The complement of an event in probability is the probability of the event not happening.

#7

What is a probability chain in probability theory?

A sequence of dependent events
Explanation

A probability chain is a series of events where each event's probability depends on the outcome of the previous event.

#8

In a deck of playing cards, what is the probability of drawing two consecutive cards of the same suit without replacement?

1/26
Explanation

The probability of drawing two consecutive cards of the same suit without replacement from a deck of cards is 1/26.

#9

What is the Law of Total Probability?

P(A) = P(A | B) * P(B) + P(A | B') * P(B')
Explanation

The Law of Total Probability states that the probability of an event A is the sum of the probabilities of A given different conditions.

#10

In a group of 30 people, what is the probability that at least two people share the same birthday?

0.95
Explanation

In a group of 30 people, the probability that at least two people share the same birthday is 0.95.

#11

What is Bayes' Theorem used for in probability theory?

Calculating conditional probability
Explanation

Bayes' Theorem is a fundamental theorem used to calculate conditional probabilities by reversing the order of conditional probabilities.

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