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Question -

The lengths of 40 leaves of a plant are measured correct to the nearest millimetre, and the data obtained is represented in the following table:
Find the mean length of leaf.



Answer -


N =40, N/2 = 40/2 =20 which lies in the class 144.5-153.5 as 17 < 20 < 29
∴ l=144.5, F= 17, f= 12, h = 9

= 144.5 + 2.25 = 146.75

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