Normal Curve: Tree Rings Tree rings dates were used extensively in archaeological studies. At one site on the mesa, tree ring dates gave a mean date of 1= 1272 standard deviation 1=35 . At a second site the tree ring dates gave a mean 2 = 1122 standard deviation 2=40 . Assume that both sites had dates that were approximately normally distributed. In the first area, an object was found and dated as 1= 1250. In the second area, another object was found and dated as 2= 1234

(a) Convert both x1 and x2 values to z values, and locate both of these values under the standard normal curve.

(b) Which of these two items is the more unusual as an archaeological find in its location?