Math 227 - Statistics » Fall 2020 » Sec 7.3 Quiz

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Question #1
A sample of size will be drawn from a population with mean 15 and standard deviation 6. Find the probability that will be greater than 16. A) 0.1170 B) 0.8508 C) 0.1492 D) 0.1271
A.   D
B.   B
C.   A
D.   C
Question #2
A survey reported that in a recent year, the mean serum cholesterol level in milligrams per deciliter for U.S. adults was 203 with a standard deviation of 39. A random sample of 102 adults was chosen. What is the probability that the mean cholesterol level is between 199 and 208? A) 0.7523 B) 1.2900 C) 0.2477 D) 0.9015
A.   A
B.   B
C.   C
D.   D
Question #3
A survey reported that in a recent year, the mean serum cholesterol level in milligrams per deciliter for U.S. adults was 204 with a standard deviation of 37. A random sample of 116 adults was chosen. Find the 33rd percentile of the sample mean. A) 187.7 B) 202.5 C) 205.1 D) 203.9
A.   B
B.   A
C.   C
D.   D

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