This video tutorial introduces conditional probability, explaining its definition, notation, and formula. It provides several examples, including drawing a queen from a deck, identifying perfect squares among odd numbers, and analyzing participants in yoga and spinning classes. The tutorial also covers using two-way tables to simplify probability calculations.

What is the definition of conditional probability?

• The probability of two independent events occurring simultaneously.

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

• The probability of an event occurring based on historical data.

• The probability of an event occurring without any prior information.

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How is the notation for conditional probability written?

• P(A|B)

• P(A,B)

• P(A+B)

• P(A-B)

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In the example of drawing a queen given a red card, what is the probability?

• 1/2

• 1/13

• 1/52

• 1/26

How many red queens are there in a standard deck of 52 cards?

• 1

• 2

• 4

• 13

What is the probability of selecting a perfect square given it is an odd number from 1 to 100?

• 1/5

• 1/2

• 1/10

• 1/20

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How many odd perfect squares are there between 1 and 100?

• 6

• 5

• 4

• 3

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In the yoga and spinning example, what is the probability of taking yoga given taking spinning?

• 1/3

• 1/2

• 15/48

• 5/16

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How many people take both yoga and spinning classes?

• 20

• 10

• 15

• 25

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In the example of being in band given not an athlete, what is the probability?

• 11/30

• 6/30

• 3/10

• 6/17

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How many students are neither athletes nor in the band?

• 6

• 13

• 10

• 11

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