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CBSE Class 8 Answered

<div>what is average</div> <div>&nbsp;</div>
Asked by pssuresh09 | 12 Apr, 2015, 08:05: AM
Expert Answer
A v e r a g e space i s space t h e space c e n t r a l space v a l u e space o f space t h e space s e t space o f space n u m b e r s. I t space g i v e s space a n space i d e a space o f space t h e space v a l u e space o f space t h e space d a t a space s e t. S u p p o s e space t h e r e space a r e space 30 space s t u d e n t s space i n space a space c l a s s. M a t h s space t e a c h e r space w a n t s space t o space k n o w space t h e space a v e r a g e space m a r k space o f space t h e space s t u d e n t s space o f space t h e space c l a s s. T h e n space s h e space w i l l space c a l c u l a t e space t h e space a v e r a g e space m a r k space o f space t h e space s e t space o f space s t u d e n t s. A v e r a g e space v a l u e space m a y space b e space l e s s space o r space m o r e space t h a n space t h e space v a l u e s space o f space t h e space d a t a space s e t. S u p p o s e space t h e r e space a r e space f i v e space s t u d e n t s comma space a n d space t h e i r space r e s p e c t i v e space m a r k s space a r e colon 55 comma 35 comma 75 comma space 80 comma space 60 T h u s comma space a v e r a g e space m a r k equals fraction numerator 55 plus 35 plus 75 plus space 80 plus space 60 over denominator 5 end fraction rightwards double arrow space a v e r a g e space m a r k equals 305 over 5 rightwards double arrow space a v e r a g e space m a r k equals 61 H e r e comma space 61 greater than 55 comma space 61 greater than 35 comma space 61 greater than 60 a n d space 61 less than 75 comma space 61 less than 80 B u t space 61 space g i v e s space y o u space a n space i d e a space o f space m a r k s space o f space t h e space s t u d e n t s.
Answered by Vimala Ramamurthy | 13 Apr, 2015, 09:04: AM
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