Probability of Likelihood

If you flip a coin, what is the probability that it will land on heads?

• 1/4

• 1/8

• 1/2

All of the probabilities in a probability distribution add up to what?

• 0

• 10

• 1

• .5

Determine which of the following distribution is NOT a probability distribution.

• A

• B

• C

• D

Is this a probability distribution?

• No, the sum of p(x) does not equal 1.

• Yes, all p(x) are between 0 and 1.

• No, all p(x) are not between 0 and 1.

• Yes, the sum p(x) is 1.

The table represents the probability of guessing correct on a 5 question true-false quiz. Find the probability all 5 questions correct.

• .03125

• .15625

• .3125

• .1875

The table represents the probability of guessing correct on a 5 question true-false quiz.  Find the probability for at least 4 questions correct.

• .03125

• .15625

• .3125

• .1875

What does P(Y<3) mean?

• The probability that the random variable Y is greater than 3.

• The probability that the random variable Y is less than 3.

• The probability that the random variable X is greater than 3.

• The probability that the random variable X is less than 3.

Find P( X = 4).

• 1.00

• 0.91

• 0.02

• 0.07

Consider the following distribution where X = number of mice caught in an apartment in a night:

Mice | Probability

0 | 0.12

1 | 0.20

2 | 0.31

3 | 0.14

4 | 0.16

5 | 0.07

What is the probability of trapping at least three mice?

• 0.14

• 0.37

• 0.23

• 0.16

Consider the following distribution where X = number of mice caught in an apartment in a night:

Mice | Probability

0 | 0.12

1 | 0.20

2 | 0.31

3 | 0.14

4 | 0.16

5 | 0.07

What is the probability of trapping fewer than 3 mice?

• 0.14

• 0.37

• 0.63

• 0.16