[Gammix]

pawn Код:

stock Float:randomEx(Float:min, Float:max)
{
    new f_min = floatround(min);
    new f_max = floatround(max);
    new Float:rand = float( random( (f_max - f_min) / 10000 )) + min;
    return rand;
}

You haven't used floatround as Misiur said! But here is the code!