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The lengths of the trout fry in a pond at the fish hatchery are approxiametly normally...

The lengths of the trout fry in a pond at the fish hatchery are approxiametly normally distributed with mean 3.4 inches and standard deviation .8 inch. Three dozen fry will be netted and their lengths measured. what is the standard deviation that we would need to use for a sample of 36 fish? b) Why might the fish in the net not represent a random sample of trout fry in the pond?

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