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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)? *



A.55%

B.5.5%

C.70.88%

D.29.12%​

Sagot :

masangcayklarissamae

Answer:

11 C

12 A

13 D

14 A

15 B

16 C

17 D

18 A

19 A

20 B

Step-by-step explanation:

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