Flashcards in CH 5 Deck (13):

1

## Rules of probabilities

###
1. P(E) must be greater than or equal to 0 and leas than or equal to 1. E = event

2. Sum must = 1

2

## Unusual event

### Typically less than 5% probability

3

## Not so unsual

### wide range

4

## Certain

### Probability of 1

5

## Impossible event

### Probability of 0

6

## P(E) = ?

###
number of possible outcomes for E / number of total outcomes

N(E)/N(S)

7

## E^c = ?

### the complement of E (all outcomes in the sample space S that are not outcomes in the event E.

8

## General addition rule to find probability

### P(E or F) = P(E) + P(F) - P(E and F)

9

## Multiplication rule (when E and F are independent)

### P(E and F) = P(E) x P(F)

10

## Complement rule = at least one

###
P(E^c) = 1 - P(E)

Example: P(at least 1 nonfiction) = 1 - P(all 4 fiction)

11

## Notation P(F| E) = ?

### Probability that the event F occurs, given that the event E has occurred.

12

## Conditional probability rule

### P(F| E) = P(E and F) / P(E)

13