I haven't seen any documentation neither, but it is possible. Please refer to the following codes.
DEF AVERAGE(DA)
VAR I,R=0
FOR I=0 TO LEN(DA)-1
INC R,DA[I]
NEXT I
R=R/LEN(DA)
RETURN R
END
DIM H[5]
H[0]=176:H[1]=189:H[2]=145:H[3]=160:H[4]=201
?"height average of five people is ";
?FORMAT$("%3.1F",AVERAGE(H))
