Statistics MCQs – Continuous Distributions Part 12
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221. A statistical analysis of long-distance telephone calls indicates that the length of these calls is normally distributed with a mean of 240 seconds and a standard deviation of 40 seconds. What is the length of a particular call (in seconds) if only 5 % of calls are shorter?
a. 146.95
b. 157.85
c. 174.21
d. 333.05
e. 305.79
Answer: C
222. A statistical analysis of long-distance telephone calls indicates that the length of these calls is normally distributed with a mean of 240 seconds and a standard deviation of 40 seconds. What is the length of a particular call (in seconds) if only 1 % of calls are longer?
a. 146.95
b. 157.85
c. 174.21
d. 333.05
e. 305.79
Answer: D
223. A statistical analysis of long-distance telephone calls indicates that the length of these calls is normally distributed with a mean of 240 seconds and a standard deviation of 40 seconds. What is the length of a particular call (in seconds) if only 5 % of calls are longer?
a. 146.95
b. 157.85
c. 174.21
d. 333.05
e. 305.79
Answer: E
224. If X ~N (μ, 25) and p (X > 12) = 0.3446. What is the value of μ?
a. 10.00
b. 5.90
c. 1.80
d. 8.05
e. 4.65
Answer: A
225. If X ~N (μ, 25) and p (X > 12) = 0.1112. What is the value of μ?
a. 10.00
b. 5.90
c. 1.80
d. 8.05
e. 4.65
Answer: B
226. If X ~N (μ, 25) and p (X > 12) = 0.0207. What is the value of μ?
a. 10.00
b. 5.90
c. 1.80
d. 8.05
e. 4.65
Answer: C
227. If X ~N (μ, 25) and p (X > 12) = 0.2148. What is the value of μ?
a. 10.00
b. 5.90
c. 1.80
d. 8.05
e. 4.65
Answer: D
228. If X ~N (μ, 25) and p (X > 12) = 0.0708. What is the value of μ?
a. 10.00
b. 5.90
c. 1.80
d. 8.05
e. 4.65
Answer: E