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  3. PERCENT OF THE 300 PEOPLE IN GROUP 1 AND THE 400 PEOPLE IN GROUP 2 WHO HAVE SELECTED AILMENTS For the seven ai

PERCENT OF THE 300 PEOPLE IN GROUP 1 AND THE 400 PEOPLE IN GROUP 2 WHO HAVE SELECTED AILMENTS For the seven ai

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问题          PERCENT OF THE 300 PEOPLE IN GROUP 1 AND THE 400 PEOPLE
               IN GROUP 2 WHO HAVE SELECTED AILMENTS

For the seven ailments, what is the median of the numbers of people in group 2 who have the ailments?
选项 A、20
B、22
C、24
D、26
E、28
答案C
解析 The median of the seven numbers of people in group 2 is the middle number when the numbers are listed in increasing order. To find the middle number easily, first order from least to greatest the percents of people in group 2 who have the seven ailments, then find the median of the percents, and finally calculate the number of people corresponding to that percent.
    The following table shows the percents of people in group 2 who have the seven ailments, ordered from least to greatest.

The median percent, which is the fourth number in the list, is 6%. Thus, the median number of people in group 2 who have the ailments is(0.06)(400), or 24, and the correct answer is Choice C.
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