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What is the average (arithmetic mean) height of the n people in a certain group?

(1) The average height of the $$\frac{n}{3}$$ tallest people n the group is 6 feet $$2\over{\frac{1}{2}}$$ inches, and the average height of the rest of the people n the group is 5 feet 10 inches.

(2) The sum of the heights of the n people is 178 feet 9 inches.
  • AStatement (1) ALONE is sufficient, but statement (2) alone is not sufficient.
  • BStatement (2) ALONE is sufficient, but statement (1) alone is not sufficient.
  • CBOTH statement TOGETHER are sufficient, but NEITHER statement ALONE is sufficien
  • DEACH statement ALONE is sufficient.
  • EStatements (1) and (2) TOGETHER are NOT sufficient.
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正确答案: A
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题目基本信息

  • 所属科目:数学DS
  • 题目来源1:PREP07 Test 2-133
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