the length of 40 leaves of a plant are measured rate correct to one millimetre and the obtained data is represented in the following table
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Length
(in mm) New length
(in mm)No. of leaves 118 - 126117.5 - 126.5 3 127 - 135 126.5 - 135.5 5 136 - 144 135.5 - 144.5 9 145 - 153 144.5 - 153.5 12 154 - 162 153.5 - 162.5 5 163 - 171 162.5 - 171.5 4 172 - 180 171.5 - 180.5 2
In order to make a histogram, we need to convert discontinuous classes to continuous classes.
Adjustment =21(lower limit of class - upper limit of previous class)
=21(127−126)=0.5
So, 0.5 needs to be subtracted from upper limit of previous class and lower limit of next class.
(ii) Frequency polygon
(iii) No. It is a range. The maximum number of leaves lies in between 144.5mm−154.5mm. Not necessary that it all occurs as 153mm length.
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