Question 7:
The distribution below gives the weights of 30 students of a class. Find the median weight of the students.
Answer:
The cumulative frequencies with their respective class intervals are as follows.
Cumulative frequency just greater than 
is 19, belonging to class interval 55 − 60.
Median class = 55 − 60
Lower limit (l) of median class = 55
Frequency (f) of median class = 6
Cumulative frequency (cf) of median class = 13
Class size (h) = 5
Therefore, median weight is 56.67 kg.
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