Discrete Distributions

• Not a binomial experiment
• Yes. n = 3
  p = 5/20 = .25 
  q = 15/20 = .75 
  x = 1, 2, 3 
• Yes. n = 3 
  p = 15/20 = .75 
  q = 5/20 = .25 
  x = 0, 1, 2, 3 
• Yes. n = 3
  p = 5/20 = .25
  q = 15/20 = .75
  x = 0, 1, 2, 3 

• Mean =7.92
  Variance =  2.6928
  Standard Deviation = 1.64
• Mean = 12 
  Variance = .66
  Standard Deviation = .44
• Mean = 12
  Variance = 7.92
  Standard Deviation = 2.814
• Mean =7.92
  Variance = 1.64
  Standard Deviation = 2.6928 

The table represents the probability of guessing correct on a 5 question true-false quiz. Find the mean and the standard deviation.

• μ = .4; σ = 7.5

• μ = 2.5; σ = 1.1

• μ = 3; σ = 1.3

• μ = .1; σ = 0

Classify: The numbers of cheeseburgers a fast-food restaurant serves each day

• Discrete

• Continuous

Is this a probability distribution?

• No

• Yes

Is this a probability distribution?

• No

• Yes

The table above shows the number of cell phones per household in a small town. Find the standard deviation. Round to the nearest hundredth.

• 0.80

• 1.70

• 1.30

• 1.00

The table above shows a television station's advertisement sales. The distribution of sales for one 24-hour day is given. Solve for the standard deviation. Round to the nearest hundredth.

• 45.81

• 266.2

• 16.30

• 0.20

Which one of the following is a discrete random variable?

• Sam's height

• Sam weight

• Time Sam's runs the 110 m hurdles

• Amount of Sam's brothers and sisters

The table above shows the number of cell phones per household in a small town. Find the mean round to the nearest hundredth.

• 2.80

• 2.93

• 0.10

• 0.14