Probability Refresh

Probability is the ? that something will happen.

• Guess

• Chance

• Probability

• Assumption

I will go to school in the next week. Is that?

• Impossible, it will not happen

• Certain, it will happen

• Likely, it probably will happen

• Unlikely, it probably will not happen

Answer explanation

It is LIKELY - it probably will happen, because in the next week - 7 days, there will be 5 school days, and unless something unexpected happens, you will be coming to school. The unexpected could be something like you getting sick or hurt, meaning you are unable to come to school.

Rolling a dice and flipping a coin are what type of events?

• Independent

• Fun

• Uncertain

• Dependent

Answer explanation

These are independent events, as rolling the dice does not affect the outcome of tossing the coin.

Tonight, the sun will go down. Is that?

• Impossible

• Likely

• Unlikely

• Certain

Answer explanation

This is CERTAIN, because the world as we know it, always has the sun rising each morning and going down each night.

What is an example that uses probability? Choose the best answer.

• Rolling a dice.

• Flipping a coin.

• Choosing a card from a pack of cards.

• All of these use probability.

Choosing one M&M from the bag, eating it and then choosing another, these are:

• Independent events.

• Bad for your teeth.

• Yummy.

• Dependent events.

Answer explanation

These are DEPENDENT events because once you have taken 1 M&M from the bag, and NOT REPLACED it, means that the total number of M&M's in the bag has changed, there are now less to choose from. When an event like taking an M&M from the bag, affects the outcome of the next event - taking another M&M from the bag, this makes the events dependent.

Picking a marble out of a bag full of marbles is:

• Unlikely

• Certain

• Impossible

• Likely

Answer explanation

The bag ONLY contains marbles, so it is CERTAIN that you will get a marble if you take something out of the bag.

An independent event is an event that does not ? another event.

• like

• help

• affect

• destroy

When you roll a 6 sided dice, to roll a number bigger than 2 is:

• Likely

• Certain

• Unlikely

• Impossible

Answer explanation

It is LIKELY because there are more chances of getting a number bigger than 2, and less chances to get a number 2 or less.

Flying to the moon after school today is:

• Unlikely

• Likely

• Impossible

• Certain

Answer explanation

It is IMPOSSIBLE to fly to the moon after school, as no-one in the class has access to a rocket capable of flying them to the moon.