数据填充题(Data Sufficiency)不仅要求考生具备基础的数学知识和熟练的计算技巧，而且更注重检验考生分析定量问题的能力。今天我们就来讲一下GMAT数据充分性试题OG练习题分析第七部分。
36. For the system of equations given, what is the value of z ?
(1)x=78
(2)t=5
翻译:看方程式求z
解析：条件一可以得出z=x+4,条件二可以得出z=8-t,都可以得出来答案选择D
37. The average (arithmetic mean) price of the 3 items that Kate purchased from a clothing store was $50. If there was no sales tax on any item that had a price of less than $80 and 6 percent sales tax on all other items, what was the total sales tax on the 3 items that Kate purchased?
(1) The price of the most expensive item that Kate purchased from the store was $100.
(2) The price of the least expensive item that Kate purchased from the store was $10.
翻译：K从一家服装店买衣服3件平均花了50$,如果衣服价钱低于80就没有销售税，反之就有销售价6%的销售税，，那么总共花了多少/
(1) 买的最贵的衣服是100
(2) 最便宜的衣服是10
解析：需要知道三件衣服的单价才能确定需不需要纳税，才能知道总共花了多少钱。所以条件一给出最贵的是100衣服总共是150，那么其他俩件加起来才50，不够纳税资格，所以可以得出100*6%+150就是花的钱。条件一满足。条件二给出最便宜的是10，那么其他俩件加起来是140，不能确定其他俩件衣服的价钱。所以答案选择A
38. A scientist recorded the number of eggs in each of 10 birds’ nests. What was the standard deviation of the numbers of eggs in the 10 nests?
(1) The average (arithmetic mean) number of eggs for the 10 nests was 4.
(2) Each of the 10 nests contained the same number of eggs.
翻译：一个科学家记录10个鸟笼的蛋数量。那么这是个鸟笼中蛋的标准差是多少?
(1) 平均值是4
(2) 每个鸟窝数量一样
解析：标准差的公式是标准差=方差的算术平方根，
需要知道每个数，知道平均值才可以算出来，条件一给出平均值但是不知道每个数，算不出来。条件二知道标准差是0
所以答案是B
39. Terry holds 12 cards, each of which is red, white, green, or blue. If a person is to select a card randomly from the cards Terry is holding, is the probability less than1/2 that the card selected will be either red or white?
(1) The probability that the person will select a blue card is1/3 .
(2) The probability that the person will select a red card is 1/6.
翻译：T手里有红 白绿，蓝四种牌，共12张，一个人随即从他手中取出一张牌，那么取出的的牌是红色或者白色的几率少于1/2。需要哪些条件?
(1) 蓝牌的几率是1/3
(2) 红牌得几率是1/6
解析：条件一蓝的是1/3，那么红，白绿有2/3的几率,但是具体红，白是多少，不确定
条件二红的几率是1/6小于1/2，但是不能确定白色的几率，答案选择E
40. The selling price of an article is equal to the cost of the article plus the markup. The markup on a certain television set is what percent of the selling price?
(1) The markup on the television set is 25 percent of the cost.
(2) The selling price of the television set is $250.
翻译：一件物品的售价等于物品的成本加上利润。那么某电视机的利润是售价的多少比例?
(1) 利润是成本的25%
(2) 售价是250
解析：条件一利润是成本的25%，假设成本是x，那么售价就是1.25x，那么就可以得出.025/1.25=0.2;条件二给出售价250，但是成本和利润都不知道是多少，所以不满足。答案是A
》》点击了解GMAT数据充分性试题OG练习题分析（六）
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