Solve Computing an Average Problem | Help

[mjcruzz]

I can't seem to understand how to solve this problem. Please help

 

[HOI]

The average of 3 numbers, a, b, and c, is [math]\frac{a+ b+ c}{3}[/math]. With the given example (3+ 4+ 8)/3= 15/3= 5.

You need "avg_sales= (numsales1+ numsales2+ numsales3)/3"

 

[HOI]

More generally, if you have n numbers, given as an array, num, and want to calculate their average it is
N= 0
for (i= 0; i< n; i++)
N= N+ num
Average= N/n;

In the case that n= 3, N would start at 0, after the i= 0 loop, N= 0+ num[0]= num[0], after the i= 1 loop, N= num[0]+ num[1], and after the i= 2 loop, N= (num[0]+ num[1])= num[2]= num[0]+ num[1]+ num[2]. The loop stops there because i= 3 does not satify "i< 3", and then Average= (num[0]+ num[1]+ num[2])/3.