Determining the probability from a given situation.

For a certain animal species, the probability that a female will have a certain number of offspring in a given year is given in the table below. Find the expected number of offspring per year.

Number of Offspring: 0
Probability: 0.31

Number of Offspring: 1
Probability: 0.21

Number of Offspring: 2
Probability: 0.19

Number of Offspring: 3
Probability: 0.17

Number of Offspring: 4
Probability: 0.12

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