if x′is are the midpoints of the class intervals of a grouped data,f

1.	if x′is are the midpoints of the class intervals of a grouped data,f′is are the corresponding frequencies and ¯x is the mean then ∑fi(xi−¯x)=? (a) 1 (b) 0 (c) -1 (d) 2
Answer» $i f x_{i}^{'} s a r e t h e m i d p o i n t s o f t h e c l a s s i n t e r v a l s o f a g r o u p e d d a t a, f_{i}^{'} s a r e t h e c o r r e s p o n d i n g f r e q u e n c i e s a n d ¯ x i s t h e m e a n t h e n \sum f_{i} (x_{i} - ¯ x) = ?$ (a) 1 (b) 0 (c) -1 (d) 2

if x′is are the midpoints of the class intervals of a grouped data,f′is are the corresponding frequencies and ¯x is the mean then ∑fi(xi−¯x)=? (a) 1 (b) 0 (c) -1 (d) 2

Answer»

$i f x_{i}^{'} s a r e t h e m i d p o i n t s o f t h e c l a s s i n t e r v a l s o f a g r o u p e d d a t a, f_{i}^{'} s a r e t h e c o r r e s p o n d i n g f r e q u e n c i e s a n d ¯ x i s t h e m e a n t h e n \sum f_{i} (x_{i} - ¯ x) = ?$

(a) 1 (b) 0 (c) -1 (d) 2

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if x′is are the midpoints of the class intervals of a grouped data,f′is are the corresponding frequencies and ¯x is the mean then ∑fi(xi−¯x)=? (a) 1 (b) 0 (c) -1 (d) 2

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