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According to the U.S. Census Bureau, the mean household income in the United States in 2000 was $57,045 and the median household income was $42,148. The variability of household income is quite large, with the 10th percentile approximately equal to $111,600, and an overall standard deviation of approximately $25,000. Suppose random samples of 225 households were selected.
a) What proportion of the sample means would be below $55,000?

b) If random samples of size 20 were selected, can you use the methods discussed in this chapter to calculate the probabilities requested in (a)-(c)? Explain.

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