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The lengths of $40$ leaves of a plant are measured, correct to the nearest millimetre and data obtained is represented in the following table :
Find the median length (in mm) of the leaves.
Find the median length (in mm) of the leaves.
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Solution: (a) Correct table:
median class: $140 - 160$
Median $= l + \frac{\frac{N}{2} - cf}{f} \times h = 140 + \frac{20 - 17}{12} \times 20 = 145$
$\therefore$ The median length of the leaves is $145\text{ mm}$
median class: $140 - 160$
Median $= l + \frac{\frac{N}{2} - cf}{f} \times h = 140 + \frac{20 - 17}{12} \times 20 = 145$
$\therefore$ The median length of the leaves is $145\text{ mm}$