We have n = 30

So, n/2 = 30/2 = 15

The cumulative Frequency just greater than n/2 is 19 then the median class is 55 – 60 such that

the lower limit (l) = 55

cumulative frequency of the class preceding 55 – 60 (cf) = 13

frequency of the median class 55 – 60 =6,

class size (h) = 5

**Using the formula,**

= 55 + 1.66

= 56.66

**So, the median weight of the students is 56.66kg**