Student ages (to the nearest year) in a school are as follows: What is true about the mean age?
A)It is less than 20.
B)It is greater than 20.
C)It is exactly 20.
D)It would remain unchanged if the 32-year-old was replaced with an 80-year-old.

Question

Student ages (to the nearest year) in a school are as follows:  What is true about the mean age?
A)It is less than 20. 
B)It is greater than 20. 
C)It is exactly 20. 
D)It would remain unchanged if the 32-year-old was replaced with an 80-year-old.

Quizplus · Accepted Answer

Since we do not have any ages greater than or equal to 20, the mean age must be less than 20. A) is incorrect. We cannot determine whether the mean age is exactly 20, so C) is incorrect. To check whether the mean would remain unchanged if the 32-year-old was replaced with an 80-year-old, we would need to calculate the new mean age. Since we cannot do that, D) is incorrect. Therefore, the best choice is B) It is greater than 20.

Student Ages (To the Nearest Year) in a School Are