Calculate the median weight of students from the following frequency distribution table.

The total number of students, $N = 40$.

The median position is $\frac{N}{2} = \frac{40}{2} = 20$.
The cumulative frequency just greater than or equal to 20 is 22, which corresponds to the class interval 50-55.
Therefore, the median class is 50-55.

From the median class 50-55:

• Lower limit of the median class, $L = 50$
• Cumulative frequency of the class preceding the median class, $cf = 14$
• Frequency of the median class, $f = 8$
• Class size, $h = 55 - 50 = 5$
• $\frac{N}{2} = 20$

The formula for the median is:

The median weight of the students is $\text{53.75 kg}$.