R. Morris and E. Watson studied various aspects of process capability in the paper "Determining Process Capability in a Chemical Batch Process" (Quality Engineering, Vol. 10(2), pp. 389-396). In one part of the study, the researchers compared the variability in product of a particular piece of equipment to a known analytic capability to decide whether product consistency could be improved. The following data were obtained for 10 batches of product.

Construct a stem-and-leaf diagram for these data with
a. One line per stem.
b. Two lines per stem.
c. Which stem-and-leaf diagram do you find more useful? Why?

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30.1 30.7 30.2 29.3 31.0 29.6 30.4 31.2 28.8 29.8 2 9