AnswersGrade 7 MathematicsProbability

Practice Test Answers

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Herky found that 8 out of every 100 beans in his garden were nibbled by rabbits. How many beans can he expect to be damaged if there are 450 beans in his garden?

A
18 beans
B
108 beans
C
36 beans
D
72 beans
2
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Which statements about experimental probability are true? Choose three correct answers.

A
An experiment to determine probability will include a number of trials.
B
Experimental probability has the total number of trials in the numerator and the number of times an event occurs in the denominator.
C
A probability experiment will count the number of times an event occurs.
D
Experimental probability is the same as theoretical probability.
E
Experimental probability can be written in the form of a ratio.
3

A cube is numbered 1 through 6. If the cube is rolled twice, how many of the possible outcomes will have two even numbers?

A
3
B
9
C
36
D
18
4

Which describes dependent events?

A
drawing the ace of spades from a deck of cards, putting it back into the deck, and drawing the king of spades
B
drawing a blue marble and a yellow marble at the same time from a bag of marbles
C
flipping two coins at the same time and getting heads on one and tails on the other
D
rolling a six-sided number cube and getting an even number, then rolling the same six-sided number cube and getting an even number again
5

Byron bought a keyless entry door lock that has the digits 0 through 9 on the keypad. He wants to choose a three-digit entry code. How many different combinations are possible, if the digits can be repeated?

A
27
B
1,000
C
30
D
729
6

Viktoria knows that it is impossible to remove a red marble from her bag that has no red marbles in it. If she reaches into the bag and pulls out a marble without looking, what is the probability that the marble will be red?

A
1
B
3 fourths
C
1 over 11
D
0
7

Jamaal knows that it is certain that he will win the election because he is the only person who is running for class treasurer. Which value represents the probability that he will win the election?

A
1 fourth
B
1
C
0
D
3 fourths
8

What is the probability of spinning blue or green?

A
3 eighths
B
1 eighth
C
1 half
D
5 eighths
9

He plans to spin it 80 times. Which equation predicts the number of times that he could spin green?

A
P(green) is equal to 1 half times 80
B
P(green) is equal to 1 eighth times 80
C
P(green) is equal to 2 eighths times 80
D
P(green) is equal to 3 eighths times 80
10

What is the probability of getting a number less than 3 and a tails?

A
1 fourth
B
1 over 12
C
1 sixth
D
1 third

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