Subscripted arrays?

[unknowngiver]

Hey
I have a C assignment and this is what it reads:

(1) Solve this problem using one single subscripted array. Read 20 integers from the keyboard and find the maximum and minimum of these values. Find the average of the maximum and minimum as an integer value where any fractional part is discarded. Find and print at the screen the number of integers read in that are greater than or equal to this average, and the number of values read in that are less than this average. Use the following test values:
10 -11 12 13 -14 15 16 -17 18 19 20 -21 10 11 12 -13 14 -15 16 -17

I have two questions

1. What does "Subscripted array" mean?
2. What does it mean when it says : "fractional part is discraded"