Question
Prove : $\cot ^2 \theta-\frac{1}{\sin ^2 \theta}=-1$
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|
Class interval
|
$10-30$
|
$30-50$
|
$50-70$
|
$70-90$
|
$90-110$
|
$110-130$
|
|
Frequency
|
$5$
|
$8$
|
$12$
|
$20$
|
$3$
|
$2$
|
|
Lifetimes (in hours)
|
0-20
|
20-40
|
40-60
|
60-80
|
80-100
|
100-120
|
|
No. of components
|
10
|
35
|
52
|
61
|
38
|
29
|