Question

One dimension of bird beaks is “depth”—the height of the beak where it arises from the bird’s head. During a research study on one island in the Galapagos archipelago, the beak depth of all Medium Ground Finches on the island was found to be normally distributed with mean μ = 9.6 millimeters and standard deviation σ = 1.1 millimeter. What is the probability that the mean depth in 15 randomly selected Medium Ground Finches is at least 10 millimeters?

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Answer 1