Cheek teeth of extinct primates. Refer to the American Journal of Physical Anthropology (Vol. 142, 2010) study of the dietary habits of extinct mammals, Exercise 2.9

(p. 66). Recall that 18 cheek teeth extracted from skulls of an extinct primate species discovered in western Wyoming were analyzed. Each tooth was classified according to degree of wear (unworn, slight, light-moderate, moderate, moderate-heavy, or heavy). The 18 measurements are reproduced in the accompanying table. One tooth is randomly selected from the 18 cheek teeth. What is the probability that the tooth shows a slight or moderate amount of wear?

Transcribed Image Text:

Data on Degree of Wear Unknown Unknown Unknown Moderate Slight Slight Slight Heavy Unworn Light-moderate Unknown Moderate-heavy Moderate Slight Light-moderate Moderate Unworn Unknown