Suppose the members of population A, consisting of Al, Bob, Curt, Doris, and Ellie, receive annual incomes of $4,000, $3,200, $2,400, $1,800, and $1,200, respectively. The members of population B, consisting of Fred, George, Holly, Irma, and Joan, receive incomes of $4,000, $3,000, $1,250, $950, and $800, respectively. We

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DTo determine the distribution of income, we can look at the spread between the highest and lowest incomes and how incomes are distributed among individuals. For population A, the spread is from $1,200 to $4,000, and for population B, it is from $800 to $4,000. However, the key is how the incomes are distributed among the individuals. Population A has a smoother gradient of income reduction ($4,000, $3,200, $2,400, $1,800, $1,200), whereas population B has a steeper drop to the lower incomes ($4,000, $3,000, $1,250, $950, $800), indicating a less equal distribution.For the second part, calculating the total income for population A ($12,600) and determining the income of the richest quintile (Al's income of $4,000), we find that Al's income is indeed 31.7% of the total income, not 40%. Thus, the statement D is incorrect based on the calculation, but since the explanation is required only for the correct answers and there was a misunderstanding in the calculation process, the focus remains on the explanation for choice B as the correct interpretation of income distribution.

Suppose the Members of Population A, Consisting of Al, Bob