This learning unit on descriptive statistics is one in the Choice Series, a self-learning development program for supervisors. Purpose stated for the approximately eight-hour-long unit is to enable the supervisor to understand the nature and uses of statistics at work, understand information which is obtained from figures at work, use statistics to present and describe numerical data, and form judgments by "reading" various kinds of data presentations and statistics. An introduction provides an overview of the unit and lists unit objectives. Parts A through D contain informative material, activities and answer keys, self-checks and answer keys, and a summary. Topics include uses and nature of statistics, "on the average," grouped data, and the spread values. Part E contains performance checks--an end check to be completed alone and a tutor check and work-based project. Part F consists of a brief unit review, extensions (print sources of additional information, such as units or sections in books), and a list of references. (YLB)