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4) Length (L) = 4/5 cm
Width (W) = 3/8 cm
Perimeter = 2( L +W )
= 2(4/5 +3/8)
= 2(32+15)/40
= 2 ( 47/40)
= 47/20 cm
5) Subtract 58.728 from 85.009, you'll get the answer, See the attachment
6) Mean is the total of obsevation divided by no. of obsevation.
See in the attachment
HOPE IT HELPED
ENJOY MATHS !!!
(SK STUDY POINT SILIGURI)
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