Compound probability flashcards: rules & trees

Question 1

What is compound probability?

Accepted Answer

The probability of two or more events considered together (such as $A	ext{ and }B$ or $A	ext{ or }B$), often using the addition or multiplication rules.

Question 2

State the multiplication rule for independent events $A$ and $B$.

Accepted Answer

$$P(A	ext{ and }B)=P(A)\cdot P(B)$$

Question 3

Compute: A bag has 3 red and 2 blue marbles. Two marbles are drawn without replacement. Find $P(	ext{red then blue})$.

Accepted Answer

$P(R	ext{ then }B)=\frac35\cdot\frac24=\frac{3}{10}$.

Compound probability flashcards: rules & trees

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