Question

The lengths of 40 leaves of a plant are measured correctly to the nearest millimetre, and the data obtained is represented in the following table:

Length (in mm)	118-126	127-135	136-144	145-153	154-162	163-171	172-180
Number of Leaves	3	5	9	12	5	4	2

Find the median length of the leaves.

Answer 1

Here, the classes are not in inclusive form So, we first convert them  in inclusive form by subtracting h/2 from the lower limit and adding h/2 to the upper limit of each ,where h is the difference between the lower limit of a class and the limit of preceding class.

Now, we have