Additional Probability Practice

Flip a coin two times

• Independent

• Dependent

Draw a red marble, keep it, then draw a blue marble.

• Independent

• Dependent

What is the probability of flipping a coin twice and landing on Tails both times?

• $\frac{1}{2}$

• $\frac{2}{2}$

• $\frac{4}{1}$

• $\frac{1}{4}$

Flipping a coin then rolling a number cube

• Independent

• Dependent

What is the probability of picking a blue marble?

• $\frac{3}{7}$

• $\frac{7}{3}$

• $\frac{4}{7}$

• $\frac{7}{4}$

What is the probability of picking a blue marble, putting it back in the bag, then picking a red marble?

•  $\frac{3}{7}\times\frac{3}{7}$  

•  $\frac{4}{7}\times\frac{4}{7}$  

•  $\frac{4}{7}\times\frac{3}{6}$  

•  $\frac{4}{7}\times\frac{3}{7}$  

A class has 10 girls and 15 boys. If two students are chosen at random, what is the probability that they are both girls?

• $\frac{10}{25}\times\frac{10}{25}$

• $\frac{10}{25}\times\frac{9}{25}$

• $\frac{10}{25}\times\frac{9}{24}$

• $\frac{9}{25}\times\frac{10}{24}$

P(green)

• $\frac{3}{7}$

• $\frac{1}{3}$

• $\frac{1}{2}$

• $\frac{7}{3}$

What is the probability of picking a green marble, keeping it, then picking another green marble?

• $\frac{3}{7}\times\frac{3}{7}$

• $\frac{3}{7}\times\frac{2}{6}$

• $\frac{3}{7}\times\frac{3}{6}$

• $\frac{3}{7}\times\frac{7}{3}$

If you spin two times, what is the probability of landing on green both times?

• $\frac{1}{6}+\frac{1}{6}$

• $\frac{1}{6}\times\frac{1}{6}$

• $\frac{1}{6}\times\frac{2}{6}$

• $\frac{1}{3}\times\frac{1}{3}$