According to the American Association of University Women, the mean age of men who have a college degree at their first marriage is 29.9 years. The mean age of women with a college degree at their first marriage is 28.4 years. Which of the following must be true about the combined mean age m of all people with college degrees at their first marriage?
A. m = 29.15
B. m > 29.15
C. m < 29.15
D. 28.4 < m < 29.9
Answer:D
According to the American Association of University Women, the mean age of men who have a college degree at their first marriage is 29.9 years. The mean age of women with a college degree at their first marriage is 28.4 years. Which of the following must be true about the combined mean age m of all people with college degrees at their first marriage?
A. m = 29.15 B. m > 29.15 C. m < 29.15 D. 28.4 < m < 29.9
Explanation: D