Flashcards in Word Problems And Stats Deck (11)

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1

## "AND" probabilities...

###
...use the words AND or BOTH

...happen IN A ROW

...happen AT THE SAME TIME

2

## "OR" probabilities...

###
...use the word OR

...use the phrase AT LEAST

3

## Ask at the start of every OR question

### Can both events occur?

4

##
OR probabilities:

If the answer is YES - the events can happen at the same time.

###
...This means the events are INDEPENDENT.

(1) add the probabilities that either happens

(2) subtract the probability that BOTH event occur

5

## Complements

### Determine the probability of the opposite of what you're looking for, and subtract it from 1 to get what you're looking for

6

## "At Least Once" shortcut

###
Odds of an Event + Odds of its Complement = 1

At least once = 1-Never

7

## Rate problems

### Rate X Quantity (e.g. Time) = Work (or Distance)

8

## Proportion rate problem

###
LABEL each item within the proportion. Then cross-multiply to solve the equation.

But be careful of inverse relationships. In these cases, set the products of the quantities equal to each other and solve.

9

## 1 kilometre = how many meters?

### 1,000 meters

10

## 1 meter = how many centimetres?

### 100 cm

11