Class Interval
Frequency
100-12
12
120-140
14
140-160
8
160-180
6
180-200
10
mean is 145.20
If true then enter $1$ and if false then enter $0$

non of thease

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can not det

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Solution

The correct option is C 1
$F o r g r o u p e d d a t a w h e n C l a s s I n t e r v a l i s g i v e n, w e f i n d t h e C l a s s M a r k . C l a s s M a r k = m i d p o i n t o f a n i n t e r v a l = \frac{(L o w e r l i m i t + U p p e r l i m i t)}{2} C l a s s M a r k i s t a k e n a s x_{i} f o r e a c h c l a s s i n t e r v a l . F i n d x_{i} f_{i} . F r o m t h e t a b l e, w e h a v e Σ x_{i} f_{i} = 7260 & Σ f_{i} = 50 M e a n = \frac{Σ x_{i} f_{i}}{Σ f_{i}} = \frac{7260}{50} = 145.20$

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