Question

Draw frequency polygons for each of the following frequency distributions :
(a) using histogram (b) without using histogram
(i)

C.I	10-30	30-50	50-70	70-90	90-110	110-130	130-150
f	4	7	5	9	5	6	4

Answer 1

$\sqrt{-(9-4x^2{)}^2(x^2-9)}$

$(4x^2-9)\sqrt{(x^2-9)}$

$=\frac{3}{x^2-9}$

$A(1,3)mp(3,5)nB(7,9)$

$\frac{7\times m+n}{m+n}=3$

$7m+n=3m+3n$

$4m=2n$

$\frac{m}{n}=\frac{1}{2}$

CI	F
10-30	4
30-50	7
50-70	5
70-90	9
90-110	5
110-130	6
130-150	4

C.I	class mark	f
-10-10	0	0
10-30	20	4
30-50	40	7
50-70	60	5
70-90	80	9
90-100	100	5
10-130	120	6
30-150	140	4
50-170	160	0