GRE Exam Numerical Ability Number System

3.7, 4.1, a, 8.5, 9.2, 2a
The six numbers shown are listed in increasing order. Which of the following values could be the range of the six numbers? Indicate all such values.
(A) 4.0
(B) 5.2
(C) 7.3
(D) 11.6
(E) 12.9
(F) 14.1

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GRE Other Question
If y^(-2) + 2y^(-1) – 15 = 0 which of the following could be the value of y.
(A) 3
(B) 1/5
(C) -1/5
(D) -1/3
(E) -5 If cube root(x) = 3, and x = Sqrt(y), What is the value of y.