GMAT Practice Question Set #20 (Question 58-60)

Data Sufficiency Question #59: Barrel of Liquid Mixture  
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A study involved a total of 6 barrels of a liquid mixture. If the standard deviation of the volume of liquid in the barrels was 10 liters at the start of the study, what was the standard deviation of the volumes of liquid in the barrels at the end of the study?

(1) At the start of the study, the researchers were required to remove 30% from each of the volumes of liquid mixture.

(2) The average (arithmetic mean) volume of liquid mixture in the barrels at the end of the study was 63 liters.

(A)

Statement 1 alone is sufficient but statement 2 alone is not sufficient to answer the question asked.

(B)

Statement 2 alone is sufficient but statement 1 alone is not sufficient to answer the question asked.

(C)

Both statements 1 and 2 together are sufficient to answer the question but neither statement is sufficient alone.

(D)

Each statement alone is sufficient to answer the question.

(E)

Statements 1 and 2 are not sufficient to answer the question asked and additional data is needed to answer the statements.

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