Suppose species 1 in has mass 10 kg, species 2 has mass 5 kg, and species 3 has mass 15 kg. Find the expected mass of the immigrants of each species that arrive. Find the expected total mass of all immigrants.
Suppose annual immigration into a park by three species follows the probabilities in the table.

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Number of Immigrants Species 1 0.3 0.6 0.1 Species 2 0.6 0.2 0.2 Species 3 0.1 0.3 0.6