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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• 所属科目:数学DS
• 题目来源1:PREP07 Test 2-133
• 正确率: 63%
• 难度: 中等