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A population has a standard deviation of $500 and a mean of $800. In addition a sample of 100 shows a standard deviation of $250

A population has a standard deviation of $500 and a mean of $800. In addition a sample of 100 shows a standard deviation of $250 plus most people live in homes with their puppies, watch television and have telephones to call their friends about the shows on television... What is the standard error of the mean

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