Probability Review

Does the theoretical probability of the event “flip heads” change when a coin is flipped more times in an experiment?

• Yes

• No

The yearbook club is handing out T-shirts to its members. There are 6 blue, 8 green, 7 red, and 4 yellow T-shirts in all. If Jacob is handed a T-shirt, what is the probability that the color is red or green?

•  $\frac{8}{15}$ 

• $\frac{3}{5}$

• $\frac{7}{25}$

• $\frac{7}{11}$

Students are drawing marbles from a jar.

There are 20 black, 10 yellow, 12 orange, and 8 purple wristbands.

What is the probability of drawing an orange marble?

• $\frac{12}{30}$

• $\frac{6}{25}$

• $\frac{3}{10}$

• $\frac{12}{20}$

Tags

CCSS.7.SP.C.7B

A game has 5 different colored marbles: red, orange, yellow, green and blue. During the game, students draw out marbles one at a time and then put them back in the jar. The table shows the results of drawing marbles 150 times.

What is the theoretical probability of drawing a green?

• 20%

• $\frac{1}{6}$

• 50%

• $\frac{31}{150}$

In a game of chance, players spin the pointer of a spinner with four equal-sized sections.

Which outcome has an experimental probability closest to its theoretical probability?

• Red

• Yellow

• Green

• Blue

Steven records the number of winners of three Ring Toss games in the table.

Based on the data recorded in the table, how many winners should Heath expect if there are 550 players?

• 183

• 231

• 201

• 155

Tags

CCSS.6.RP.A.3B

In a school contest, each student draws a number from 1 to 5 out of a large basket. The outcomes are shown in the table.

Based on the data, what is the experimental probability of drawing a 2?

• $\frac{1}{5}$

• $\frac{86}{340}$

• $\frac{67}{340}$

• $\frac{87}{340}$

Tags

CCSS.7.SP.C.6

Rachel plays a game by rolling two number cubes with sides numbered 1 through 6.

To win the game, the sum of the numbers facing up must be 6. What is the probability that Rachel will win the game?

• $\frac{5}{36}$

• $\frac{1}{6}$

• $\frac{1}{18}$

• $\frac{7}{36}$

A game has 5 different colored marbles: red, orange, yellow, green and blue. During the game, students draw out marbles one at a time and then put them back in the jar. The table shows the results of drawing marbles 150 times.

What is the experimental probability of drawing a green?

• $\frac{1}{5}$

• $\frac{31}{150}$

• 20%

• 50%

Tags

CCSS.7.SP.C.6