Q) The length of 40 leaves of a plant are measured correct to nearest millimetre, and the data obtained is represented in the following table:
Find the mean length of the leaves.
Let’s re-arrange the data with midpoint of each class, frequency, and multiply midpoint with frequency:
We know that, mean value of grouped data is given by:
Mean value =
From above table with rearranged data, we get the following values:
Therefore, Mean value = = 146.975 mm
Hence, the mean length of the leaves is 146.975 mm.