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Fifteen small Allen's hummingbirds has an average weight of 3.15 grams.Based on previous studies, the standard deviation for the weight of this type of hummingbird

Fifteen small Allen's hummingbirds has an average weight of 3.15 grams.Based on previous studies, the standard deviation for the weight of this type of hummingbird is equal to 0.33 grams.Find an eighty percent confidence interval for the average weights of Allen's hummingbirds.

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