ProbabilityProbability

Chances or odds of an event occurring

Chances or odds of an event occurring

There are different outcomes

There are different outcomes

• Unlikely• Likely• Always (no other possibilities)• Never (impossible)

• Unlikely• Likely• Always (no other possibilities)• Never (impossible)

Spinner 1Spinner 1• Look at this

picture. If it was used as a spinner, you would have the same chance of landing on blue, yellow, red, and green.

• Look at this picture. If it was used as a spinner, you would have the same chance of landing on blue, yellow, red, and green.

Spinner 2Spinner 2• Look at this

picture. Do you have the same chance of landing on yellow as you do blue or red?

• What color are you more likely to land on?

• Look at this picture. Do you have the same chance of landing on yellow as you do blue or red?

• What color are you more likely to land on?

Spinner 3Spinner 3• What if this

picture was used to make a spinner? What are the chances of landing on yellow? Green? Blue?

• What if this picture was used to make a spinner? What are the chances of landing on yellow? Green? Blue?

Dice Dice• Dice - means a

pair of cubes with dots on them

• Die - means one cube

• The number of dots are from 1-6

• Dice - means a pair of cubes with dots on them

• Die - means one cube

• The number of dots are from 1-6

Die 1Die 1• Each number

appears on a die only one time.

• Since there are 6 numbers, the probability of rolling numbers 1-6 is 1/6 or one out of six.

• Each number appears on a die only one time.

• Since there are 6 numbers, the probability of rolling numbers 1-6 is 1/6 or one out of six.

Die 2Die 2

• If you are using a die, what is the probability of rolling a two? A four? A three? A nine? A seven?

• If you are using a die, what is the probability of rolling a two? A four? A three? A nine? A seven?

Die 3Die 3• If you are rolling

dice, what is the probability of rolling a seven? A nine?

• Remember dice means two cubes and there are 12 possibilities.

• If you are rolling dice, what is the probability of rolling a seven? A nine?

• Remember dice means two cubes and there are 12 possibilities.

Deck of CardsDeck of Cards• How many cards

are in a deck, excluding jokers?

• How many are red?

• How many are black?

• How many cards are in a deck, excluding jokers?

• How many are red?

• How many are black?

Deck of Cards 2Deck of Cards 2

• How many are hearts? Diamonds? Spades? Clubs?

• How many are queens? Aces? Kings? Jacks?

• How many are hearts? Diamonds? Spades? Clubs?

• How many are queens? Aces? Kings? Jacks?

Deck of Cards 3Deck of Cards 3• To determine the

probability of drawing a particular card, first count the number of cards, then count how many are that particular kind.

• To determine the probability of drawing a particular card, first count the number of cards, then count how many are that particular kind.

Deck of Cards 4Deck of Cards 4

• What is the probability of drawing a 4? A King? A red card? A club?

• What is the probability of drawing a 4? A King? A red card? A club?

Colored ObjectsColored Objects• You can determine

the probability of colored objects by counting how many objects there are altogether and how many there are of a particular color.

• You can determine the probability of colored objects by counting how many objects there are altogether and how many there are of a particular color.

Colored Objects 2Colored Objects 2• If there were 32

marbles in this jar and 9 of them were blue, then the probability of drawing a blue marble would be 9/32 or 9 out of 32.

• If there were 32 marbles in this jar and 9 of them were blue, then the probability of drawing a blue marble would be 9/32 or 9 out of 32.

Let’s PracticeLet’s Practice

• http://nlvm.usu.edu/en/nav/frames_asid_186_g_1_t_1.html

• http://www.bbc.co.uk/education/mathsfile/shockwave/games/fish.html

• http://nlvm.usu.edu/en/nav/frames_asid_186_g_1_t_1.html

• http://www.bbc.co.uk/education/mathsfile/shockwave/games/fish.html