The Wind Mountain archaeological site is located in southwestern New Mexico. Wind Mountain was home to an ancient culture of prehistoric Native Americans called Anasazi. A random sample of excavations at Wind Mountain gave the following depths (in centimeters) from present-day surface grade to the location of significant archaeological artifacts.

85,45,120,80,75,55,65,60,65,95,90,70,75,65,68

Compute a99%confidence interval for the mean depthat which archaeological artifacts from the Wind Mountain excavation site can be found. (Round your answers to one decimal place.)

a: lower limit=

b: upper limit=