# mathematics

Question 1 of 20

1.0 Points

If a die is rolled one time, find the probability of getting a number greater than 2.

A.2

B.-1

C.5/6

D.4/6

Reset Selection

Question 2 of 20

1.0 Points

The result of tossing a coin once will be either head or tail. Let A and B be the events of observing head and tail, respectively. The events A and B are:

A.mutually exclusive

B.independent

C.conditional

D.unilateral

Reset Selection

Question 3 of 20

1.0 Points

What is the probability of drawing two queens in a row from a standard deck of cards without replacement?

A.0.0059

B.0.0385

C.0.0015

D.0.0045

Reset Selection

Question 4 of 20

1.0 Points

If the probability that it will rain tomorrow is 0.38, then the probability that it will not rain tomorrow is:

A.0.38

B.-0.38

C.0.62

D.1.38

Reset Selection

Question 5 of 20

1.0 Points

If A and B are mutually exclusive events with P(A) = 0.70, then P(B):

A.cannot be larger than 0.30

B.can be any value between 0 and 0.70

C.cannot be determined with the information given

D.can be any value between 0 and 1

Reset Selection

Part 2 of 6 –

Question 6 of 20

1.0 Points

In one town 33% of the households have a vehicle with all-wheel drive. If 4 households are selected at random, what is the probability that all 4 have vehicles with all-wheel drive?

A.0.0119

B.0.33

C.0.0825

D.0.4662

Reset Selection

Question 7 of 20

1.0 Points

A pet supplier has a stock of parakeets of which 10% are blue parakeets. A pet store orders 3 parakeets from this supplier. If the supplier selects the parakeets at random, what is the chance that the pet store gets exactly one blue parakeet?

A.0.081

B.0.243

C.0.027

D.0.003

Reset Selection

Question 8 of 20

1.0 Points

The probability distribution associated with the number of cartoons watched by Mrs. Kelly’s first grade class on Saturday morning is shown below.

x

P(x)

0

0.15

1

0.20

2

0.30

3

0.10

4

0.20

5

0.05

Find the standard deviation for the probability distribution above.

A.1.46

B.2.25

C.1.89

D.1.18

Reset Selection

Question 9 of 20

1.0 Points

Which of following statements are true regarding the probability distribution of a random variable X?

A.The probabilities must be nonnegative

B.The probabilities must sum to 1

C.The random variable must be continuous

D.Both (a) and (b)

Reset Selection