Statistics and Probability

Which of the following random variables should be considered continuous?

• The time it takes a randomly chosen woman to run 100 meters

• The number of orders received by a mail order company in a randomly chosen week

• The number of brothers a randomly chosen person has

• The number of cars owned by a randomly chosen adult male

Is this a probability distribution? Why or why not?

• YES

• NO

Q. Is this a probability distribution?

• YES

• NO

Find the mean of the probability distribution below.

• 2.1

• 2.2

• 2.3

• 2.4

What is the percentage of data that falls within two standard deviations of the mean?

• 95%

• 68%

• 100%

• 99.7%

What is the percentage of data that falls within three standard deviations of the mean?

• 95%

• 68%

• 100%

• 99.7%

What is the percentage of data that falls within one standard deviation of the mean?

• 95%

• 68%

• 100%

• 99.7%

The Empirical (68-95-99.7) Rule can be applied only if data is ....

• Normally Distributed

• Skewed

• Uniform

• Symmetric

What shape is a normal distribution curve?

• Half curve

• Bell curve

• Round curve

• Square curve

What is the the total area under the standard normal distribution curve?

• 0.25

• 0.50

• 0.75

• 1