Probability STAAR Review

Jack tossed a coin three times. Which tree diagram shows all the possible outcomes of the coin landing heads up or tails up?

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Bailey will roll a number cube and flip a coin for a probability experiment. The faces of the number cube are labeled 1 through 6. The coin can land on heads or tails. If Bailey rolls the number cube once and flips the coin once, which list contains only the outcomes in which the number cube lands on a number greater than 4?

• 5, Heads

  5, Tails

  6, Heads

  6, Tails

• 5, Heads

  6, Tails

• 1, Heads

  1, Tails

  2, Heads

  2, Tails

  3, Heads

  3, Tails

  4, Heads

  4, Tails

  5, Heads

  5, Tails

  6, Heads

  6, Tails

• 4, Heads

  4, Tails

  5, Heads

  5, Tails

  6, Heads

  6, Tails

A study of a population of 1,200 frogs revealed that 12 out of every 180 frogs in the population have spots on their back. Based on the results of this study, how many frogs in the population do NOT have spots on their back?

• 80

• 168

• 1,280

• 1,120

At an assembly 7 out of the first 10 students who entered the gym were carrying a backpack. Based on this information, if 700 students were at the assembly, how many students could be expected to be carrying a backpack?

• 70

• 717

• 490

• 210

The spinner shown has eight congruent sections. The spinner is spun 120 times. What is a reasonable prediction for the number of times the spinner will land on an even number?

• 75

• 45

• 15

• 40

A bag contains:

• 5 red marbles
• 6 blue marbles
• 3 green marbles
• 4 black marbles
• 2 yellow marbles

A marble will be drawn from the bag and replaced 100 times. What is a reasonable prediction for the number of times a green or black marble will be drawn?

• 14

• 65

• 7

• 35

The spinner shown is divided into congruent sections that are labeled form 1 through 7. If the spinner is spun one time, what is the probability of the arrow not landing on a section labeled with an odd number?

• 4/7

• 3/4

• 1/4

• 3/7

The manager of a movie theater randomly surveyed 50 people who entered the movie theater on Friday. The manager asked about the type of movie each person preferred. The results of the survey are shown in the table. Based on the results in the table, which statement about a person who will go to this theater next Friday is true?

• The person is three times as likely to prefer comedy as horror.

• The person is twice as likely to prefer drama as horror.

• The person is less likely to prefer horror or drama than action.

• The person is more likely to prefer horror or comedy than action or drama.

The 200 students in a school band will attend an awards dinner. A random survey of 25 of these students was conducted to determine how many of each meal should be prepared for the dinner. The results of the survey are shown.

• 12 students want a beef meal.
• 8 students want a chicken meal.
• 5 students want a pasta meal.

Based on the survey results, which of these is the best prediction of the meals wanted by the 200 students?

• There are 16 students who want a beef meal.

• There are 52 students who want either a chicken meal or a pasta meal.

• There are 32 more students who want a beef meal than want a chicken meal.

• There are 24 more students who want a pasta meal than want a chicken meal.

Mari bought 6 packets of tomato seeds. Each packet contained 24 seeds. She planted 1 packet of the seeds, and 15 seeds sprouted.

Which statement about the seeds in the remaining packets is best supported by this information?

• No more than 50 seeds will sprout.

• Between 50 and 100 seeds will sprout.

• At least 100 but no more than 120 seeds will sprout.

• All 120 seeds will sprout.