In archaeology, the depth (below surface grade) at which artifacts are found is very important. Greater depths

Question:

In archaeology, the depth (below surface grade) at which artifacts are found is very important. Greater depths sometimes indicate older artifacts, perhaps from a different archaeological period. Figure 2-17 is a back-to-back stem plot showing the depths of artifact locations at two different archaeological sites. These sites are from similar geographic locations. Notice that the stems are in the center of the diagram. The leaves for Site I artifact depths are shown to the left of the stem, while the leaves for Site II are to the right of the stem (see Mimbres Mogollon Archaeology by A. I. Woosley and A. J. McIntyre, University of New Mexico Press).
(a) What are the least and greatest depths of artifact finds at Site I? at Site II?
(b) Describe the data of depths of artifact finds at Site I and at Site II.
(c) At Site II, there is a gap in the depths at which artifacts were found. Does the Site II data suggest that there might have been a period of no occupation?
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