Biologists define a “hot spot” as a species-rich geographical area (10-kilometer square). Nature (Sept. 1993) reported on a study of hot spots for several rare British species, including butterflies, dragonflies, and breeding birds. The table on pg. 130 gives the proportion of a particular species found in a hot spot for that or another species. For example, the value in the lower left corner, .70, implies that 70% of all British bird species inhabit a butterfly hot spot. (Note: It is possible for species hotspots to overlap.)

a. What is the probability that a dragonfly species will inhabit a dragonfly hot spot?
b. What is the probability that a butterfly species will inhabit a bird hot spot?
c. Explain why all butterfly hot spots are also bird hot spots.

Transcribed Image Text:

Proportion Found in Butterfly Hot Spots Dragonfly Hot Spots Bird species Hot Spots Butterflies 91 91 1.00 Dragonflies .82 .92 .92 Birds .70 .73 .87