1. Control charts for a process have previously been constructed. The X-Bar Chart upper and lower control limits are 92.5 and 88.5, respectively. New samples are taken from three machines with the following results:

   Machine	Measurements
   #1	93.4	92.2	91.9	92.7
   #2	88.3	95.1	90.6	94.8
   #3	92.5	93.1	88.9	90.3

   Which machine(s), if any, appear(s) to have an out-of-control process mean based solely on the X-Bar Chart?

   		Machine #1
   		Machine #2
   		Machine #3
   		Machine #1 and Machine #3
   		Machine #2 and Machine #3
   		All of the machines
   		None of the machines