The class intervals below represent ages of students. Which set of intervals is not mutually exclusive?

statistics

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1. The class intervals below represent ages of students. Which set of intervals is not mutually exclusive? 

a. 18-20; 22-24; 25-26

 b. 18-20; 22-24; 23-25 

c. 18-20; 21-23; 25-27 

d. 18-20; 21-23; 24-26


2. If Paul scored in the first quartile on an exam, that means that 

a. 10 percent of students who took the exam scored lower than him. b. 10 percent of students who took the exam scored higher than him. c. 25 percent of students who took the exam scored lower than him. d. 25 percent of students who took the exam scored higher than him.


3. If a distribution of scores has a mean of 30 and a variance of 0, 

a. the range is 0. 

b. the interquartile range is 0. 

c. the median is 30 

d. All of the above are correct. 


4. As both the mean and the standard deviation of a normal distribution increase, the percentage of the area between mean ± 2 standard deviations will 

a. increase. 

b. stay the same. 

c. decrease. 

d. Cannot be determined

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