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统计   题数:114
The cost of each adult's ticket for a certain concert was $30, and the cost of each child's ticket for the concert was $24. If Hannah purchased tickets for this concert, what was the average (arithmetic mean) cost per ticket?(1) Hannah purchased twice as many children's tickets as adults' tickets.(2) Hannah purchased 4 children's tickets.
When 1,000 children were inoculated with a certain vaccine, some developed inflammation at the site of the inoculation and some developed fever. How many of the children developed inflammation but not fever? (1) 880 children developed neither inflammation nor fever. (2) 20 children developed fever.
A combined total of 55 lightbulbs are stored in two boxes; of these, a total of 7 are broken. If there are exactly 2 broken bulbs in the first box, what is the number of bulbs in the second box that are not broken? (1) In the first box, the number of bulbs that are not broken is 15 times the number of broken bulbs. (2) The total number of bulbs in the first box is 9 more than the total number of bulbs in the second box.
What is the median number of employees assigned per project for the projects at Company Z?(1) 25 percent of the projects at Company Z have 4 or more employees assigned to each project.(2) 35 percent of the projects at Company Z have 2 or fewer employees assigned to each project.
If 2/5 of the students at College C are business majors, what is the number of female students at College C ?(1) 2/5 of the male students at College C are business majors.(2) 200 of the female students at College C are business majors.
k, n, 12, 6, 17What is the value of n in the list above?(1) k < n(2) The median of the numbers in the list is 10.
During a 6-day local trade show, the least number of people registered in a single day was 80. Was the average (arithmetic mean) number of people registered per day for the 6 days greater than 90 ?(1) For the 4 days with the greatest number of people registered, the average (arithmetic mean) number registered per day was 100.(2) For the 3 days with the smallest number of people registered, the average (arithmetic mean) number registered per day was 85.
Of the 60 animals on a certain farm, 23 ​ are either pigs or cows. How many of the animals are cows? (1) The farm has more than twice as many cows as it has pigs. (2) The farm has more than 12 pigs.
A certain bookcase has 2 shelves of books. On the upper shelf, the book with the greatest number of pages has 400 pages. On the lower shelf, the book with the least number of pages has 475 pages. What is the median number of pages for all of the books on the 2 shelves?(1) There are 25 books on the upper shelf.(2) There are 24 books on the lower shelf.
Beginning in January of last year, Carl made deposits of $120 into his account on the 15th of each month for several consecutive months and then made withdrawals of $50 from the account on the 15th of each of the remaining months of last year. There were no other transactions in the account last year. If the closing balance of Carl&rsquo;s account for May of last year was $2,600, what was the range of the monthly closing balances of Carl&rsquo;s account last year?(1) Last year the closing balance of Carl&rsquo;s account for April was less than $2,625.(2) Last year the closing balance of Carl&rsquo;s account for June was less than $2,675.
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