Simple Event Probability Review

A survey showed that 8 out of 20 homeowners in a neighborhood had cable television. If there were 320 homeowners in the neighborhood, how many could be expected to have cable television?

Vincent flipped three coins during a probability experiment. The outcomes of the first 40 trails are shown in the table. Based on the information in the table, in how many of the next 120 trails will the outcome be exactly two of the coins showing heads?

• 60

• 87

• 39

• 48

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 backs?

• 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?

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 teacher has a container of paper clips. She will randomly select one paper clip from the container.

The container has 8 pink paper clips.

The container has 14 purple paper clips.

The container has 12 yellow paper clips.

The container has 16 blue paper clips.

Which statement is true?

• The probability of selecting a purple paper clip is 3/4 , and the probability of selecting a paper clip that is not. purple is 1/4.

• The probability of selecting a purple paper clip is 1/4 , and the probability of selecting a paper clip that is not. purple is 3/4.

• The probability of selecting a purple paper clip is 18/25 , and the probability of selecting a paper clip that is not. purple is 7/25.

• The probability of selecting a purple paper clip is 7/25 , and the probability of selecting a paper clip that is not. purple is 18/25.

The spinner shown is divided into congruent sections that are labeled from 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 table shows the numbers of different colors of pencils in a pencil case. A student will randomly select one pencil from the pencil case.

Based on the information in the table, which statement is true?

• The pencil is least likely to be blue. (Blue is the smallest number of pencils)

• The pencil is 4 times as likely to be purple as it is to be red. ( p=4r )

• The pencil is equally as likely to be blue or green. ( b=g )

• The pencil is more likely to be purple than all the other colors combined. ( purple is bigger than blue + red + green. )

Neha has 5 pink bows, 1 blue bow, and 4 purple bows in a box. She will randomly choose 1 bow from the box.

What is the probability Neha will choose a purple bow.

• 1/2

• 2/5

• 1/10

• 3/5

A classroom is arranged with 8 seats in the front row, 10 seats in the middle row, and 12 seats in the back row. The teacher randomly assigns seats to students as they enter the classroom.

What is the probability that the first student who enters the classroom will be assigned a seat in the front row?

• 2/5

• 2/3

• 4/11

• 4/15