Probability Flashcards by Ainara Moreno Mejia

Q

The Basic Probability Formula

A

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Q

The Probability of Sample Space

A

Must sum to 1

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Q

Complementary Events

A

P(A) + P(Not A) = 1

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Q

The Probability of A and B

A

If A and B are independent:

P(A and B) = P(A) x P(B)

If A and B are not independent:

P(A and B) = P(A) x P(B|A)

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Q

The Addition Rule

A

Mutually Exclusive Events

P(A or B) = P(A) + P(B)

Events That Are Not Mutually Exclusive

P(A or B) = P(A) + P(B) - P(A and B)

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Q

Probability of “Choosing At Least 1 Object”

A

P(at least 1 item occurs)

= 1 - P(none of these items occur)

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