SoldjahBoy- lol and to create random value there is random(x) funtion which apparently generates a random number from 0 to x, so in order to have random time respawn we have to change a little the event.
"Every 2000+1000*random(1)+1000*random(5) miliseconds" -> "System: Create object Zombie on layer 1 at (x,y)"
in before question why random(1)+random(5) becouse i dont know if random have some kind of number limits so it will go as it.
Edit: The green text is heresy... now it should go like this
"Every 2000+1000*random(7) miliseconds" -> "System: Create object Zombie on layer 1 at (x,y)"
Becouse number 1 is new 0 in construct =D