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题库解析   >   统计 题型   >   OG19新题
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OG19新题

【OG20-P286-382题】

Last year, in a certain housing development, the average (arithmetic mean) price of 20 new houses was $160,000. Did more than 9 of the 20 houses have prices that were less than the average price last year?
(1)Last year the greatest price of one of the 20 houses was $219,000.
(2)Last year the median of the prices of the 20 houses was 150,000

    A.Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
    B.Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
    C.BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.
    D.Each statement ALONE is sufficient.
    E.Statements (1) and (2) TOGETHER are NOT sufficient.

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答案:
B

条件1:�

�于平均数的有多少无法求出,不充分

条件2:中位数150000<160000,有10个不高于150000,所以至少有10个少于平均数,充分


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