The data in the accompanying table are from an ecological study of the entire rainforest community at El Verde in Puerto Rico (Waide and Reagan 1996). Diet breadth is the number of types of food eaten by an animal species. The number of animal species having each diet breadth is shown in the second column. The total number of species listed is n = 127. 

a. Calculate the median number of prey types consumed by animal species in the community.

b. What is the interquartile range in the number of prey types? Use the method outlined in Section 3.2 to calculate the quartiles.

c. Can you calculate the mean number of prey types in the diet? Explain.

Transcribed Image Text:

Diet breadth (number of prey types eaten) 11 22 33 44 55 66 77 88 99 1010 1111 1212 1313 1414 1515 1616 1717 1818 Frequency (number of species) 2121 88 99 1010 88 33 44 88 44 44 44 22 55 22 11 11 22 11