# Question

In the Southern Ocean food web, the krill species Euphausia superba is the most important prey species for many marine predators, from seabirds to the largest whales. Body lengths of the species are normally distributed with a mean of 40 mm and a standard deviation of 12 mm.

a. Sketch the normal curve for the krill lengths.

b. Find the sampling distribution of the sample mean for samples of size 4. Draw a graph of the normal curve associated with x-bar.

c. Repeat part (b) for samples of size 9.

a. Sketch the normal curve for the krill lengths.

b. Find the sampling distribution of the sample mean for samples of size 4. Draw a graph of the normal curve associated with x-bar.

c. Repeat part (b) for samples of size 9.

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