Unit 10 Probability

Jonah has 4 red blocks, 12 blue blocks, 7 green blocks, and 9 yellow blocks in a bag. If he draws a block from the bag without looking, which color will he LEAST likely draw? Explain your reasoning.

• red

• blue

• green

• yellow

Which events are complementary? Select ALL that apply.

• The probability of spinning red is 0.37 and the probability of spinning blue is 0.77

• The probability of spinning red is 20% and the probability of spinning blue is 80%

• The probability of spinning red is

  2/5 and the probability of spinning blue is 2/5

• The probability of spinning red is 0.49 and the probability of spinning blue is 0.51

Use the spinner below to answer the question.

The spinner is spun once. What is the complement of landing on a 7? Explain your reasoning.

• 1/8

• 1/7

• 7/8

• 6/7

Trevor has a bag that contains 2 red marbles, 6 blue marbles, and 4 green marbles. He will randomly select one quarter. Based on the situation, which event has a probability of 1/6?

• 2 red marbles

• 6 blue marbles

• 4 green marbles

Four students flipped a fair coin 100 times. They recorded their results in the table.

Whose results were the LEAST like the expected results when flipping a fair coin?

• Lisa

• Andrew

• Jeremy

• Sandra

When rolling a standard number cube, what is the theoretical probability of rolling a 3? Give the theoretical probability as a fraction, decimal, and percentage.

• 1/2, 0.5, 50%

• 1/8, 0.125, 12.5%

• 1/6, 0.17, 17%

• 1/10, 0.1, 10%

Alice’s shirt drawer contains the following shirts: 2 red, 3 brown, 1 black, 4 grey, and 6 white. If Alice randomly picks a shirt from the drawer, what is the probability that the shirt she chooses is NOT brown?

• 3/16

• 3/10

• 1/16

• 13/16

Julie rolled a fair number cube 12 times. The table below shows the results.

Which “Number on Cube” had an experimental probability identical to the theoretical probability of being rolled?

5

• 1

• 2

• 3

• 4

• 5

There are 24 tiles in a hat numbered 1 through 24. Alena randomly draws a tile with the number 6 on it and sets it aside. If Alena randomly draws another tile, what is the probability that she will select a tile marked with a 16?

• 1/23

• 1/24

• 16/24

• 6/24

You are playing a game. A spinner is divided into six equal sections labeled 1, 2, 3, 4, 5 and 6. To make a move in the game, the spinner is spun and then either a yellow or orange card is randomly chosen. What is the probability that the spinner will land on the number 6 and a yellow card is chosen?

• 1/6

• 1/2

• 1/12

• 1/8