Thread: Average

The average of 5 results is 46 and that of first 4 is 45.The fifth result is
(a)1
(b)10
(c)12.5
(d)50

Hello,

Originally Posted by devi

The average of 5 results is 46 and that of first 4 is 45.The fifth result is
(a)1
(b)10
(c)12.5
(d)50

The average of 5 results is given this way :

, where a,b,c,d,e are the results. In general, you divide the sum of the results by the number of results.

We know that the sum of the first 4 is 45, let's say a+b+c+d=45 and that the average is 46.



Solve for e...

e+45=46
46-45=e
e=1