CK-12-Basic Probability and Statistics Concepts - A Full Course

3.1. Discrete Random Variables http://www.ck12.org

Practice

1. Match the following statements from the first column with the probability values in the second column.

TABLE3.1:

Probability Statement P(X)

a. The probability of this event will never occur. P(X) = 1. 0

b. The probability of this event is highly likely. P(X) = 0. 33

c. The probability of this event is very likely. P(X) = 0. 67

d. The probability of this event is somewhat likely. P(X) = 0. 00

e. The probability of this event is certain. P(X) = 0. 95

2. Match the following statements from the first column with the probability values in the second column.

TABLE3.2:

Probability Statement P(X)

a. I bought a ticket for the State Lottery. The probabil-

ity of a successful event (winning) is likely to be:

P(X) = 0. 80

b. I have a bag of equal numbers of red and green jelly

beans. The probability of reaching into the bag and

picking out a red jelly bean is likely to be:

P(X) = 0. 50

c. My dad teaches math, and my mom teaches chem-

istry. The probability that I will be expected to study

science or math is likely to be:

P(X) = 0. 67

d. Our class has the highest test scores in the State Math

Exams. The probability that I have scored a great mark

is likely to be:

P(X) = 1. 0

e. The Chicago baseball team has won every game this

season. The probability that the team will make it to the

playoffs is likely to be:

P(X) = 0. 01

3. Read each of the following statements and match the following words to each statement. You can put your
   answers directly into the table. Here is the list of terms you can add:
   
   
   • certain or sure
   
   
   • impossible
   
   
   • likely or probable
   
   
   • unlikely or improbable
   
   
   • maybe
   
   
   • uncertain or unsure
   
   
   
   

TABLE3.3:

Statement Probability Term

Tomorrow is Friday.

I will be in New York on Friday.

It will be dark tonight.

It is snowing in August!

China is cold in January.