The following data are measurements of body mass, in grams, of finches captured in mist nets during a survey of various habitats in Kenya, East Africa (Schluter 1988).

a. Calculate the mean body mass of each of these three finch species. Which species is largest, and which is smallest?

b. Which species has the greatest standard deviation in body mass? Which has the least?

c. Calculate the coefficient of variation (CV) in mass for each finch species. How different are the coefficients between the species? Compare the differences in CVs with the differences in standard deviation calculated in part (b).

d. The following measurements are of another trait, beak length, in mm, of the 16 white-browed sparrow weavers. Which measurement is more variable in this species (relative to the mean), body mass or beak length?

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Crimson- 8, 8, 8, 8, 8, 8, 8, 6, 7, 7, 7, 8, 8, 8, 7, 7. 78, 8, 8, 8, 8, 8, 8, 6, 7, 7, 7, 8, 8, 8, 7, 7, 7 rumped waxbill Cutthroat finch White- browed sparrow weaver 16, 16, 16, 12, 16, 15, 15, 17, 15, 16, 15, 1616, 16, 16, 12, 16, 15, 15, 17, 15, 16, 15, 16 40, 43, 37, 38, 43, 33, 35, 37, 36, 42, 36, 36, 39, 37, 34, 4140, 43, 37, 38, 43, 33, 35, 37, 36, 42, 36, 36, 39, 37, :