Class began with a discussion involving statistics and how it is used to solve epidemiological investigations. Specifically the use by a group of researchers in Canada who were trying to find a cause for sudden infant mortality in a pediatric cardiac unit. How the use of graphs, means and medians and deviations help to narrow down the cause was discussed. Orders of operation were done to reinforce the last lesson on operations. Parts of a circle were presented and defined and described including chords, secants, tangents and arcs. Each was defined along with a drawn circle showing the segment. The use of lines and letters to represent each segment was also presented.