Statistics

71. If events A and B are mutually exclusive with P(A) = 0.2 and P(B) = 0.2, what is P(A or B)?

• A 0.040
• B 0.4 Correct answer
• C 1.00
• D 0.00

72. In a Poisson distribution with parameter lambda = 3, the mean and variance are respectively:

• A 3 and 3 Correct answer
• B 3 and 1.73
• C 9 and 3
• D 3 and 9

73. The probability of an event that is absolutely certain to occur is:

• A 0
• B 0.5
• C 1 Correct answer
• D Infinity

74. Which probability distribution is characterized by the 'lack of memory' (memoryless) property?

• A Normal Distribution
• B Binomial Distribution
• C Exponential Distribution Correct answer
• D Poisson Distribution

75. The sum of probabilities of all sample points in a sample space is always:

• A 0
• B 1 Correct answer
• C 0.5
• D Between 0 and 1

76. For a Standard Normal Distribution, the mean and standard deviation are:

• A Mean = 1, SD = 0
• B Mean = 0, SD = 1 Correct answer
• C Mean = 0, SD = Var
• D Mean = 100, SD = 15

77. If the probability of occurrence of event A is 0.3, the probability of its complement (not A) is:

• A 0.7 Correct answer
• B 0.3
• C 0.15
• D 1.00

78. The total area under the probability density curve of a normal distribution is:

• A 0.5
• B 1.0 Correct answer
• C 2.0
• D 100

79. Which of the following value cannot be a probability?

• A 0.0
• B 1.0
• C -0.15 Correct answer
• D 0.75

80. In a normal distribution, what percentage of values fall within one standard deviation of the mean?

• A 68.27% Correct answer
• B 95.45%
• C 99.73%
• D 50.00%