25 Cheek teeth of extinct primates . In the American Journal of Physical Anthropology (Vol. 142, 2010) study of the dietary habits of extinct mammals, 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, lightmoderate, moderate, moderate-heavy, or heavy). The 18 measurements are reproduced in the accompanying table and saved in the CHEEKTEETH file. 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?

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