Probability

CERTAIN means that ...

• an event will happen without a doubt

• 50-50 chances that the event will happen

• there aren’t many chances that the event will happen

IMPOSSIBLE means that ...

• an event will happen without a doubt

• 50-50 chances that the event will happen

• there is no chance that the event will happen

EQUAL PROBABILITY means that ...

• an event will happen without a doubt

• 50-50 chances that the event will happen

• there is no chance that the event will happen

Which color is more likely to appear?

• blue

• pink

• green

There are 8 balls. 3 are green. Which fraction shows the chance of getting a green ball?

• $\frac{2}{8}$

• $\frac{3}{8}$

• $\frac{5}{8}$

There are 10 marbles. Which color is the most likely to appear?

• blue

• green

• yellow

• red

Only 1 marble is yellow. Which fraction tells us its chance to appear?

• $\frac{10}{1}$

• $\frac{1}{2}$

• $\frac{1}{10}$

Which is the correct comparison?

• yellow marbles > blue marbles

• yellow marbles = blue marbles

• yellow marbles < blue marbles

What is the probability of getting RED?

• $\frac{1}{3}$

• $\frac{1}{4}$

• $\frac{3}{4}$

What is the probability of NOT GETTING RED?

• $\frac{1}{3}$

• $\frac{1}{4}$

• $\frac{3}{4}$