I need help please,, iss askin for Andy’s hardware cost per foot and bargains hardware cost per foot, and I also need an explanation for why thanks

Margie is practicing for an upcoming tennis tournament. her first serve is good 20 out of 30 times on average. margie wants to know the estimated probability that her first serve will be good at least four of the next six times she serves. how could she design a simulation for this scenario?