单选题For integer values of the age from 10 months to 14 months, the average (arithmetic mean) weight falls approximately between ______ pounds.A 750 and 850B 850 and 950C 950 and 1050

题目
单选题
For integer values of the age from 10 months to 14 months, the average (arithmetic mean) weight falls approximately between ______ pounds.
A

750 and 850

B

850 and 950

C

950 and 1050


相似考题
更多“单选题For integer values of the age from 10 months to 14 months, the average (arithmetic mean) weight falls approximately between ______ pounds.A 750 and 850B 850 and 950C 950 and 1050”相关问题
  • 第1题:

    由于循环硫化床锅炉的燃烧温度较低,一般为()。因此,有利于脱硫和降低NOx的排放。

    A 750~850℃

    B 850~950℃

    C 950~1050℃

    D 1050~1150℃


    参考答案: B

  • 第2题:

    CRH5型动车组中间车钩高()mm。

    • A、850
    • B、950
    • C、1000
    • D、1050

    正确答案:B

  • 第3题:

    烟煤炼焦的温度为()

    • A、850-1050℃
    • B、750-950℃
    • C、950-1050℃
    • D、550-650℃

    正确答案:C

  • 第4题:

    我国铁路货物列车到发线有效长采用有()。

    • A、1050、950、850、750、650
    • B、1050、950、850、750、550
    • C、1050、900、850、750、650
    • D、1050、850、750、650、550

    正确答案:D

  • 第5题:

    单选题
    The average (arithmetic mean) of c and d is 12, and the average of c, d, and e is 10. What is the value of e?
    A

    6

    B

    10

    C

    12

    D

    18

    E

    20


    正确答案: A
    解析:
    根据题目中已知的数量关系,可列等式如下:c+d= 12×2=24……①;c+d+e=10×3=30……②。把等式①代入等式②得,24+e=30,e=6。

  • 第6题:

    单选题
    The service life of distress signals must be not more than().
    A

    forty two months from the date of manufacture

    B

    thirty six months from the date of the last inspection

    C

    twenty four months from the date of approval

    D

    twelve months from the date of purchase


    正确答案: D
    解析: 暂无解析

  • 第7题:

    单选题
    ()半焦开始转变为焦炭,950-1050℃焦炭成熟。
    A

    650℃

    B

    750℃

    C

    850℃


    正确答案: B
    解析: 暂无解析

  • 第8题:

    问答题
    If a is an integer, is b an integer?  (1) The average (arithmetic mean) of a and b is an integer.  (2) The average (arithmetic mean) of a, b, and b+4 is a.

    正确答案: D
    解析:
    根据算数平均数的定义可知,本题应选D项。

  • 第9题:

    单选题
    微库仑法测定水中AOX时,燃烧热解炉的温度至少要达到()℃。
    A

    750

    B

    850

    C

    950

    D

    1050


    正确答案: C
    解析: 暂无解析

  • 第10题:

    单选题
    我国铁路货物列车到发线有效长采用有()。
    A

    1050、950、850、750、650

    B

    1050、950、850、750、550

    C

    1050、900、850、750、650

    D

    1050、850、750、650、550


    正确答案: C
    解析: 暂无解析

  • 第11题:

    单选题
    The average (arithmetic mean) of x and y is m, where m ≠ 0. What is the average (arithmetic mean) of x, y, and 2m?
    A

    m

    B

    4/3m

    C

    3/2m

    D

    5/3m

    E

    2m


    正确答案: D
    解析:
    因为x和y的算术平均数为m,所以x+y=2m,所以,所以x,y,2m的算术平均数为x+y+2m/3,因为x + y = 2m,所以x+y+2m/3=4m/3

  • 第12题:

    问答题
    What is the average (arithmetic mean) of x and y?  (1) The average of x+3 and y+5 is 14.  (2) The average of x,y and 16 is 12.

    正确答案: D
    解析:
    将两条件分别代入计算可知,x和y的平均数均为10,故本题选D项。

  • 第13题:

    开式驾驶室应有不小于()毫米高度栏杆。

    A、850

    B、950

    C、1000


    参考答案:C

  • 第14题:

    入炉铁水温度要求大于()℃。

    • A、850
    • B、950
    • C、1050
    • D、1250

    正确答案:D

  • 第15题:

    硅整流发电机空载转速为()r/min。

    • A、750~800
    • B、850~950
    • C、1000~1250
    • D、1500~2000

    正确答案:C

  • 第16题:

    ()半焦开始转变为焦炭,950-1050℃焦炭成熟。

    • A、650℃
    • B、750℃
    • C、850℃

    正确答案:A

  • 第17题:

    问答题
    If 10a + 10b =35, what is the average (arithmetic mean) of a and b?

    正确答案: 1.75
    解析:
    由10a+10b=35可得10(a+b)=35→a+b=3.5,所以a和b的平均数是3.5÷2=1.75。

  • 第18题:

    单选题
    The percent change in the weight from age 2 months to age 10 months is approximately ______ the percent change in the weight from age 10 months to age 19 months.
    A

    equal to

    B

    2 times

    C

    3 times


    正确答案: C
    解析:
    根据图表可知,大象在2个月大到10个月大时体重几乎增加了一倍,而从10个月大到19个月大时体重增加了1/2,因此前一个比例变化是后者的2倍。

  • 第19题:

    单选题
    If 70% of the bananas in a particular harvest had an average (arithmetic mean) length of 7 inches and 30% of the bananas in that harvest had an average (arithmetic mean) length of 5 inches, what was the average (arithmetic mean) length, in inches, of all of the bananas in the harvest?
    A

    6.0

    B

    6.2

    C

    6.4

    D

    6.6

    E

    6.8


    正确答案: B
    解析:
    假设共有100个香蕉,根据题干全部香蕉的长度为(100×70%×7)+(100×30%×5)=640英尺,共有100只香蕉,所以平均每只香蕉的长度为640/100=6.4。故选C。

  • 第20题:

    单选题
    The average (arithmetic mean) of five numbers is 10. The sum of three of the numbers is 30. What is the sum of the other two numbers?
    A

    5

    B

    10

    C

    20

    D

    30

    E

    40


    正确答案: C
    解析:
    The arithmetic mean of the five numbers is 10. That means the sum of the numbers is 50. The sum of three numbers is 30. so the sum of the remaining two numbers is 50-30 = 20.

  • 第21题:

    单选题
    For integer values of the age from 10 months to 14 months, the average (arithmetic mean) weight falls approximately between ______ pounds.
    A

    750 and 850

    B

    850 and 950

    C

    950 and 1050


    正确答案: C
    解析:
    在10个月时,大象的体重大约为800磅,到了14个月大象的体重大约为1000磅,在这期间大象的体重变化比较平稳,因此体重平均数大约为900磅,故答案选B。

  • 第22题:

    单选题
    If the average (arithmetic mean) of 3, 7, 10, and x is 7, then what is the median of 3,7,10, and x?
    A

    5.5

    B

    6

    C

    6.5

    D

    7

    E

    7.5


    正确答案: D
    解析:
    因为3,7,10,和x 的平均数是7,可得出等式(3+7+10+x)/4=7,(20 + x)/4= 7,20+ x = 28,x = 8。所以3,7,10,和x四个数排序为3,7,8,10,它们的中位数为(7+8)/2=7.5。

  • 第23题:

    单选题
    If the average (arithmetic mean) of a, b, 4, and 10 is 8, what is the value of a + b?
    A

    4

    B

    6

    C

    9

    D

    15

    E

    18


    正确答案: B
    解析:
    根据题干可得出(a+ b + 10 + 4)/4=8,a + b=18。

  • 第24题:

    问答题
    MegaTech and UltraCorp are considering a merger to form the MegaUltraTech Corporation. Does MegaTech have more employees than UltraCorp?  (1) The average (arithmetic mean) age of UltraCorp employees is 32.8, while the average age of MegaTech employees is 27.2.  (2) If the merger goes through and all employees from both companies remain employed, the average (arithmetic mean) age of the MegaUltraTech employees will be 31.4.

    正确答案: C
    解析:
    条件1、2中均不涉及两个公司的员工数量,但是将两者综合可以推断出UltraCorp的员工数大于MegaTech,故本题选C项。