Ответ:
Код ниже
Объяснение:
program calcAverage;
const n = 100;
var S, counter, i: integer;
a: array [1..n] of integer;
begin
randomize;
S := 0;
counter := 0;
for i := 1 to n do begin
a[i] := Random(100) - 50;
if (a[i] > -15) and (a[i] < 20) then begin
counter := counter + 1;
S := S + a[i];
end;
end;
writeln('Среднее арифметическое: ', S/counter);
end.