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Twenty-five senior citizens in a city were randomly sampled. The average monthly out-of-pocket cost for prescription drugs for the sample was found to be $300,

Twenty-five senior citizens in a city were randomly sampled. The average monthly out-of-pocket cost for prescription drugs for the sample was found to be $300, with a standard deviation of $100. The standard error would then be

A. $20
B. $30
C. $40
D. $50
E. None of the above

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