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he mean amount spent per perwon on prescription drugs in a recent year in the United States was $480 with a standard tviation of 551 . A random sample of 145 U.S. residents is selecred. A. What is the sampling distribution of the ample mean amount spent on prescription drugs per year of 145 US. residents? Approximately normal because the distribution of the amount spent on drugs is approximately normal. Unknown. Approximately normal because the sample size ot 145 is large enough. Approximately normal because the sample mean distribucion is alwayr approximately normal. 18. What is the probability that the average amount spent on preseriprion drugs per year of 145 U.S, resideno is at least 8473 ? Answer C. What is the probahility that the average amount spent on preseriptiou drugs per year of 145 U.S. neadents is at moit 84883 Answith.

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