SAT官方每日一题：2012年4月9日

SAT官方每日一题：2012年4月9日

日期:2012-04-21

2012年04月09日

　　考试类型: Mathematics > Standard Multiple Choice

　　Read the following SAT test question and then click on a button to select your answer.

　　If a number is chosen at random from the set (negative 10 comma negative 5 comma 0 comma 5 comma 10) , what is the probability that it is a member of the solution set of both (3 times x) minus 2 less than 10 and x + 2 greater than negative 8 ?

　　B. 1 over 5

　　C. 2 over 5

　　D. 3 over 5

　　E. 4 over 5

正确答案:C

解析:

If (3 times x) minus 2 less than 10 and x + 2 greater than minus 8 , then negative 10 less than x less than 4 . The numbers from the listed set that satisfy these inequalities are negative 5 and . There are five elements in the listed set, so the probability of a number chosen at random from the set being a member of the solution set of both inequalities is 2 over 5 .