11.The average time it takes a group of college students to complete a certain examination is 50 minutes. The standard deviation is 6 minutes. Assume that the variable is normally distributed. What is the probability that a randomly selected college student will complete the examination in less than 46 minutes. *
A.25.14%
B.74.86%
C.15.54 %
D.50.02%
12.The average time it takes a group of college students to complete a certain examination is 50 minutes. The standard deviation is 6 minutes. Assume that the variable is normally distributed. What is the probability that a randomly selected college student will complete the examination in less than 46 minutes. If 25 randomly selected college students take the *
A.37.07%
B.62.93%
C.12.93%
D.50.02
13.In a group of 49 randomly selected unicorns, the mean is 1,000 and the standard deviation is 28, what is the standard deviation of the sampling distribution? *
A.7
B.4
C.0.57
D.1.75
14.The average number of milligrams (mg) of cholesterol in a cup of a certain brand of ice cream is 660 mg, and the standard deviation is 35mg. Assume the variable is normally distributed. If a cup of ice cream is selected, what is the probability that the cholesterol content will be more than 670mg? What is the value of z-score? *
A.-0.29
B.0.29
C.0.1141
D.0.3859
15.The average number of milligrams (mg) of cholesterol in a cup of a certain brand of ice cream is 660 mg, and the standard deviation is 35mg. Assume the variable is normally distributed. If a cup of ice cream is selected, what is the probability that the cholesterol content will be more than 670mg? What is P(x>670)? *
A.-0.29
B.0.29
C.0.1141
D.0.3859
16.The average number of milligrams (mg) of cholesterol in a cup of a certain brand of ice cream is 660 mg, and the standard deviation is 35mg. Assume the variable is normally distributed. If a cup of ice cream is selected, what is the probability that the cholesterol content will be more than 670mg?
A.2.9%
B.11.49%
C.38.59%
D.3.5%
17.The average number of milligrams (mg) of cholesterol in a cup of a certain brand of ice cream is 660 mg, and the standard deviation is 35mg. Assume the variable is normally distributed. If a cup of ice cream is selected, what is the probability that the cholesterol content will be more than 670mg? If a sample of 10 cups of ice cream is selected, what is the probability that the mean of the sample will be larger than 670mg? What is the equivalent z-value? *
A.0.9
B.-0.9
C.0.3159
D.0.1841
18.The average number of milligrams (mg) of cholesterol in a cup of a certain brand of ice cream is 660 mg, and the standard deviation is 35mg. Assume the variable is normally distributed. If a cup of ice cream is selected, what is the probability that the cholesterol content will be more than 670mg? If a sample of 10 cups of ice cream is selected, what is the probability that the mean of the sample will be larger than 670mg? What is the P(X>670)?
A.0.9
B.-0.9
C.0.3159
D.0.1841
19.The average precipitation for the first 7 months of the year is 19.32 inches with a standard deviation of 2.4 inches. Assume that the average precipitation is normally distributed. What is the probability that a randomly selected year will have precipitation greater than 18 inches for the first 7 months? What is its z-score? *
A.-0.55
B.0.55
C.0.7088
D.0.2912
20.The average precipitation for the first 7 months of the year is 19.32 inches with a standard deviation of 2.4 inches. Assume that the average precipitation is normally distributed. What is the probability that a randomly selected year will have precipitation greater than 18 inches for the first 7 months? What is P(x>18)? *
