Find the median weight for the following data:

Weigh(in kg)	Number of boys
45	8
46	5
48	6
50	9
52	7
54	4
55	2

Cumulative frequency table :

Total number of observations = 41, which is odd.

By formula,

Median = $\dfrac{n + 1}{2}$ th observation

⇒ $\dfrac{41 + 1}{2}$ th observation

⇒ $\dfrac{42}{2}$th observation

⇒ 21st observation

From the table,

From 20th to 28th position, the weight = 50 kg

∴ Median = 50 kg.

Hence, median weight is 50 kg.