Probability — Test Answers

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3

What is the probability of rolling a sum of 8 ?

A
7 over 36
B
5 over 36
C
1 over 12
D
1 sixth
4

According to the tree diagram, which best describes how many choices Jamie has for his pizza?

A
three choices for size, two choices for crust, and two choices for topping
B
two choices for size, two choices for crust, and one choice for topping
C
two choices for size, two choices for crust, and two choices for topping
D
three choices for size, two choices for crust, and one choice for topping
6

The experimental probability of getting a 6 on a number cube is 7 over 40 Which is true about the event’s experimental probability?

A
The number cube was rolled a total of 47 times.
B
After 7 trials, the number 6 came up 40 times.
C
The number 6 came up 7 times out of a total of 40 trials.
D
The number 6 came up a total of 40 times.
11

Selena is buying an audio system for her car. She can choose among 3 types of stereos, 4 kinds of speakers, and 2 kinds of amplifiers. Which describes how Selena can show her options?

A
List the 3 types of stereos. Draw branches from each type and list the 4 speakers at the ends. Then, draw a branch from the speaker and list 1 amplifier at the end.
B
List the 3 types of stereos. Draw branches from each type and list the 4 speakers at the ends.
C
List the 3 types of stereos. Draw branches from each type and list the 4 speakers at the ends. Then, draw branches from each speaker type and list the 2 amplifiers at the ends.
D
List 1 stereo. Draw a branch from the stereo and list 1 speaker at the end. Then, draw a branch from the speaker and list 1 amplifier at the end.
14

Josephine noticed that out of 10 e-mails she received, 7 were advertisements. What can she predict about the number of advertisements she will receive in the next 100 e-mails?

A
She will receive 70 advertisements.
B
She will receive 90 advertisements.
C
She will receive 10 advertisements.
D
She will receive 7 advertisements.

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