MS-DOS QBasic
Версия 1.0
Copyright (C) Microsoft Corporation, 1987-1991.

CLS
DIM n AS INTEGER
INPUT "n=", n
DIM a(1 TO n) AS INTEGER
RANDOMIZE TIMER
s = 0
FOR i = 1 TO n
   a(i) = 101 * RND - 50
   PRINT a(i);
   s = s + a(i)
NEXT i
PRINT
m = s / n
k = 0
FOR i = 1 TO n
   IF a(i) > m THEN k = k + 1
NEXT i
PRINT "k="; k

Пример
n=15
-13  17  43 -39 -20 -13 -5  32  12 -10  22 -24  31  6 -19
k= 7

Если не изменяет память- то вот:
INPUT "vvedite n", n
INPUT "vvedite m", m
DIM a(n, m)
FOR i = 1 TO n
FOR j = 1 TO m
INPUT "vvedite element", a(i, j)
NEXT j
NEXT i
PRINT "_____"
PRINT "matrica"
FOR i = 1 TO n
FOR j = 1 TO m
PRINT a(i, j)
NEXT
NEXT
PRINT "______"
FOR i = 1 TO n
FOR j = 1 TO m
v = v + a(i, j): k = k + 1
NEXT
NEXT
sr = v / k
PRINT "srednee", sr
FOR i = 1 TO n
FOR j = 1 TO m
IF a(i, j) > sr THEN c = c + 1
NEXT
NEXT
PRINT "kol-vo", c