outhern 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.  What is the probability that the mean length of a sample of four krill is more than 49 mm? Please first describe the distribution of the mean length of a sample of four krill.

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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. 

What is the probability that the mean length of a sample of four krill is more than 49 mm? Please
first describe the distribution of the mean length of a sample of four krill. 

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