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试卷名称:GMAT（QUANTITATIVE）数学练习试卷3

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The following data sufficiency problems consist of a question and two statements, labeled (1) and (2), in which certain data are given.You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of counterclockwise), you must indicate whether 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.

Kara attends a university where students study for an average (arithmetic mean) of 13.4 hours per week. How many hours per week does Kara study? (1) The standard deviation of study time at Kara’s school is 2.8. (2) Kara’s study time is one standard deviation away from the mean.

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The cards in a deck are numbered consecutively from 1 to 20. If some cards are red and some cards are black, what is the probability of drawing a red card? (1) The odd-numbered cards are all red. (2) The even-numbered cards are all black.

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Lottery balls numbered consecutively from 1 through 100 are placed in a spinner. If one ball is drawn at random, what is the probability that it will have the number 1 on it exactly once?[*][*]

WINK, Inc. follows a certain procedure that requires two tasks to be finished independently in order for a job to be done. On any given day, there is a 7/8 probability that task 1 will be completed on time, and a 3/5 probability that task 2 will be completed on time. On a certain day, what is the probability that task 1 will be completed on time, but task 2 will not?[*]

The following data sufficiency problems consist of a question and two statements, labeled (1) and (2), in which certain data are given.You have to decide whether the data given in the statements are sufficient for answering the question. Using the data given in the statements plus your knowledge of mathematics and everyday facts (such as the number of days in July or the meaning of counterclockwise), you must indicate whether 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.

If the sum of five consecutive odd integers is 5, which of the following could be true? Ⅰ. The average (arithmetic mean) of the list is equal to 5. Ⅱ. The median of the list is equal to 5. Ⅲ. The range of the list is equal to 5. None Ⅰ only Ⅱ only Ⅰ and Ⅱ Ⅰ and Ⅲ

A jar contains only red, yellow, and orange marbles. If there are 3 red, 5 yellow, and 4 orange marbles, and 3 marbles are chosen from the jar at random without replacing any of them, what is the probability that 2 yellow, 1 red, and no orange marbles will be chosen?[*][*]

A freight elevator can carry a maximum load of 1200 pounds. Sean, who weighs 200 pounds, is in the elevator with two packages weighing 150 pounds and 280 pounds. If he needs to fit three more packages in the elevator that weigh as much as possible without exceeding the elevator limit, what is the difference between their average and the average of the two packages already in the elevator? 25 85 190 215 210

Monthly rainfall was recorded for two towns over a five-month period using the chart above. If the median rainfall in Noah’s Landing was equal to the average (arithmetic mean) rainfall in Bellaville, what is the value of x? 1 8/5 2 3 10

If x is a positive, single-digit integer such that 4x/3,2x, x, and x+2, and 3x-2 form a non-ordered list of consecutive integers, which of the following could be the median of that list? 3 4 5 6 8

Closing prices for a certain stock were recorded each day for a week in the table above. If the monthly average (arithmetic mean) was 18.43 and the standard deviation was 0.27, how many days during this week did the closing price fall within two standard deviations from the average? 1 2 3 4 5

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