Probability Unit Test

What is the probability of randomly selecting an odd number from the numbers 1-15?

(a)  

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7.6.I

Twelve students have an equally likely chance of being selected in a drawing at school. Eight are 7th graders and four are 8th graders. What is the probability that an 8th grader will be selected?

(a)  

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7.6.I

The probability of a spinner landing on yellow is 1/4. What does it represent?

• A. P(yellow')

• B. P(blue)

• C. P(yellow)

• D. P(purple and blue)

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7.6.E

A coin is flipped, and a standard number cube is rolled. Create a tree diagram to represent the sample space.

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7.6.A

A health study of 540 adults found that only 7 in 20 adults get enough sleep each night. Based on the results of the sample, how many adults got enough sleep?

• 27

• 35

• 202

• 189

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7.6.C

Two coins are flipped. What is the probability that both coins land on heads?

(a)  

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7.6.I

At a school assembly, 3 out of the first 10 students were wearing spirit wear. Based on this information, if 400 students were at the assembly, then how many students could be expected to have on spirit wear?

(a)  

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7.6.C

There are five marbles in a bag. Three are green and two are yellow. You draw a marble, replace it, and then draw another. What is the probability of choosing two yellow marbles?

(a)  

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7.6.I

Two number cubes are rolled sequentially. What is the probability that the first number cube shows a five and the other number cube shows an even number?

(a)  

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7.6.I

There are five candies in a bag. Three are chewy, and two are chocolate. You draw a candy, do not replace it, and then draw another. What is the probability of choosing two chocolate candies?

(a)  

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7.6.I