STAAR Prep Probability K-Check

In a survey 7 out of 8 dentists recommend a ProTooth toothbrush. Based on this information, which can the toothbrush company predict about its recommendations?

• In a survey of 24 dentists, 18 of them will recommend a ProTooth toothbrush

• In a survey of 40 dentists, 33 of them will recommend a ProTooth toothbrush.

• In a survey of 64 dentists, 56 of them will recommend a ProTooth toothbrush.

• In a survey of 88 dentists, 70 of them will recommend a ProTooth toothbrush.

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7.6.D

At a pizza shop you can choose thick or thin crust, red or white sauce, and toppings of pepperoni, cheese, or vegetarian. How many different combinations are possible for someone who does not care for meat or white sauce?

• 3

• 24

• 9

• 12

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7.6.E

A basket of beads contains 8 red beads, 6 yellow beads, and 6 green beads. A bead will be drawn from the basket and replaced 150 times. What is a reasonable prediction for the number of times a green bead is drawn?

• 45

• 60

• 36

• 72

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7.6.C

Destini places the letters in the word OCTOBER into a bag. What is the probability of Destini selecting a B and then an O without replacement?

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7.6.C

The spinner is spun two times in a row. What is the probability of spinning two prime numbers?

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7.6.B

Audrey has the following t-shirts in her dresser drawer. She will randomly choose one t-shirt. Then she will replace it and choose a second t-shirt. What is the probability that she chooses a polka dot shirt and then a striped shirt?

• 5 striped t-shirts

• 6 solid t-shirts

• 2 floral t-shirts

• 2 polka dot t-shirts

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7.6.I

Neil goes to the pet shop and selects a treat for his dog. He chooses one, then chooses another. What is the probability Neil selects a bone and then a ball?

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7.6.H

Students standing in line for a theme park were surveyed about their favorite ride. Their responses are shown in the table. If one student is picked randomly, then which of the following is true?

• The student’s favorite ride is half as likely to be a live show than a roller coaster.

• The student’s favorite ride is more likely to be a carnival game than a roller coaster.

• The student’s favorite ride is twice as likely to be a roller coaster than the carnival games.

• The student’s favorite ride is twice as likely to be the carnival game than the live show.

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7.6.I

A neighborhood watch association surveyed 40 neighbors about their feelings of safety in the neighborhood. They will survey an additional 80 neighbors. Based on the information, predict how many of the 80 neighbors will feel safe?

• 39

• 24

• 36

• 40

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7.6.H

These playing cards are used in a game. What is the probability of not selecting a prime number?

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7.6.c