Confused about the biodiversity question

Hi everyone,
I don’t understand this question.

# Define a method that, given an array of specimens, returns the biodiversity
# index as defined by the following formula: number_of_species**2 *
# smallest_population_size / largest_population_size biodiversity_index(["cat",
# "cat", "cat"]) => 1 biodiversity_index(["cat", "leopard-spotted ferret",
# "dog"]) => 9

Let’s say for the example [“cat”, “cat”, “cat”].
Is it true that:

  • number_of_species = 3
  • smallest_population_size = 3 ?
  • largest_population_size = 3 ?

Therefore, 3^2 * 3 / 3 = 9 ?

Could someone who knows much about biology explain the formula for me please?
Thank you!

Yeah, the wording is a bit ambiguous. IIRC, the correct interpretation is:

number of species: 1 (cat)
smallest population: 3
largest population: 3

and

number of species: 3 (cat, ferret, dog)
smallest population: 1
largest population: 1

Hope that is of some use.

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