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,
The average of 5 results is given this way :
$\displaystyle A=\frac{a+b+c+d+e}{5}$, 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.
$\displaystyle 46=\frac{45+e}{5}$
Solve for e...