In one of the archaeological excavation sites, the artifact density (number of prehistoric artifacts per 10 liters of sediment) was 2.0 . Suppose you are going to dig up and examine 50 liters of sediment at this site. Let r= 0, 1, 2, 3,... be a random variable that represents the number of prehistoric artifacts found in your 50 liters of sediment. The formula for the probability distribution of the random variable r is given as (see attached) . Find the probability that you will find 3 or more artifacts in the 50

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