To determine the median ages for first marriage for men and women based on the box plots provided:
a. The median age for men is: From the description of the box plot for men, the horizontal line segment within the box is located at 22.8. Rounding to the nearest integer, the median age for men is:
23.
b. The median age for women is: From the description of the box plot for women, the horizontal line segment within the box is located at 20. Rounding to the nearest integer, the median age for women is:
20.
If you need further analysis on the range and comparison for men and women, let me know!