My question you did not calculate for the modal and the median

The highest frequency is 15.

The frequency of 15 corresponds to the age group 30-39.

The modal class is $\boxed{\text{30-39}}$.

3) Calculate the median.

The median class is the first class whose cumulative frequency ($cf$) is greater than or equal to the median position (24.5).
From the table, the $cf$ for 20-29 is 18, and for 30-39 is 33. Since 33 is the first $cf$ greater than or equal to 24.5, the median class is 30-39.

• Lower boundary of the median class ($L$): $30 - 0.5 = 29.5$
• Total frequency ($N$): 49
• Cumulative frequency of the class before the median class ($CF$): 18 (for 20-29)
• Frequency of the median class ($f$): 15 (for 30-39)
• Class width ($h$): $19 - 10 + 1 = 10$ (or $29.5 - 19.5 = 10$)

The median is $\boxed{\text{33.83}}$.