Probability and Statistics Quiz

Which of the following is an example of discrete variable?

• Weight of a dog.

• Depth of Mariana Trench

• Number of yellow marbles in a container.

• Height of the students in a certain class.

Suppose you tossed three coins. What are the sample spaces for the experiment?

• HHH, TTT

• TTT, HHH, TTH, THT, HTH

• TTT, HHH, HHT, THT, HTH

• TTT, TTH, THT, HTT, HHT, HTH, THH, HHH

What is the sum of the probability of each event?

• 0

• 3

• 2

• 1

What is the expected value of the given probability distribution?

• 1/25

• 12/10

• 2/10

• 2/5

Which of the following best describes the expected value of a probability distribution?

• It is the square root of the variance of the probability distribution.

• It measures the variability of the values assumed by the random variables.

• It is the average value of a random variable over numerous trials of an experiment.

• It gives the difference between the highest and lowest values assumed by the random variables.

What is the probability that more than 2 heads will be selected in the experiment?

• 7/ 8

• 4/8

• 1/8

• 1

What is the mean of the probability distribution?

• 1.2

• 1.5

• 1.6

• 1.8

What is the variance of the probability distribution?

• 0.75

• 1.00

• 1.25

• 0.50

Which of the following graphs is the BEST example of the normal curve?

• 
• 
• 
• 

How will you describe this graph?

• The shaded region of the normal curve is below the z = 1

• The shaded region of the normal curve is above the z=-1

• The shaded region of the normal curve is between z=0 and z=1

• The shaded region of the normal curve is between z= -1 and z=1