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其他   题数:500
A certain list consists of 400 different numbers. Is the average (arithmetic mean) of the numbers in the list greater than the median of the numbers in the list?(1 ) Of the numbers in the list, 280 are less than the average.(2) Of the numbers in the fist, 30 percent are greater than or equal to the average.
In quadrilateral ABCD, is angle BCD a right angle?(1) Angle ABC is a right angle(2) Angle ADC is a right angle
In a two-month survey of shoppers, each shopper bought one of two brands of detergent, X or Y, in the first month and again bought one of these brands in the second month. In the survey, 90 percent of the shoppers who bought Brand X in the first month 1 bought Brand X again in the second month, while 60 percent of the shoppers who bought Brand Y in the first month bought Brand Y again in the second month. What percent of the shoppers bought Brand Y in the second month?( 1) In the first month, 50 percent of the shoppers bought Brand X.(2) The total number of shoppers surveyed was 5,000.In a two-month survey of shoppers, each shopperbought one of two brands of detergent, X or Y, in thefirst month and again bought one of these brandsin the second month. In the survey, 90 percent ofthe shoppers who bought Brand X in the first month1 bought Brand X again in the second month, while60 percent of the shoppers who bought Brand Y in thefirst month bought Brand Y again in the second month.What percent of the shoppers bought Brand Y in thesecond month?( 1) In the first month, 50 percent of the shoppersbought Brand X.(2) The total number of shoppers surveyed was5,000.
If abc≠0 , is ab c =abc ?(1) a = 1 C(2) C = 1
If x2=2x , what is the value of x ?( 1) 2x=(x2 )3 (2 ) x=2x−2 ​
If w + z = 28, what is the value of wz ?( 1) w and z are positive integers.(2) w and z are consecutive odd integers.
How many people in Town X read neither the World newspaper nor the Globe newspaper?(1)Of the 2, 500 people in Town X, 1,000 read no newspaper.(2)of the people in Town X, 700 read the Globe only and 600 read the World only.
The arithmetic mean of a collection of 5 positive integers, not necessarily distinct, is 9. One additional positive integer is included in the collection and the arithmetic mean of the 6 integers is computed. Is the arithmetic mean of the 6 integers at least 1 0 ?( 1 ) The additional integer is at least 1 4.(2) The additional integer is a multiple of 5 .The arithmetic mean of a collection of 5 positiveintegers, not necessarily distinct, is 9. One additionalpositive integer is included in the collection and thearithmetic mean of the 6 integers is computed. Is thearithmetic mean of the 6 integers at least 1 0 ?( 1 ) The additional integer is at least 1 4.(2) The additional integer is a multiple of 5 .
The cardinality of a finite set is the number of elements in the set. What is the cardinality of set A?(1) 2 is the cardinality of exactly 6 subsets of set A(2) Set A has a total of 16 subsets, including the empty set and set A itself.
All trainees in a certain aviator training program must take both a written test and a flight test. If 70 percent of the trainees passed the written test, and 80 percent of the trainees passed the flight test, what percent of the trainees passed both tests?(1)10 percent of the trainees did not pass either test.(2)20 percent of the trainees passed only the flight test.
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