皮皮学，免费搜题
登录
搜题
【单选题】
已知一组数据x1、x2、x3、x4、x5的平均数是4，方差是5；那么另一组数据3x1－2、3x2－2、3x3－2、3x4－2、3x5－2的平均数和方差分别是( )A.
10,45
B.
10,13
C.
12,45
D.
10,43
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】Not many years ago， a wealthy and rather strange old man named Johnson lived alone in a village in the south of England. He had made a lot of money in trading with foreign countries. When he was seven...
【单选题】Ag 2 O 分解可用下面两个计量方程之一表示,其相应的平衡常数也一并列出: Ag 2 O(s) → 2Ag(s)+1/2O 2 Kp(1) 2Ag 2 O(s) → 4Ag(s)+ O 2 Kp(2) , 设气相为理想气体,且已知反应是吸热的,试判断下列结论哪个是正确的:( )
A.
Kp(2)=[Kp(1)] 1/2
B.
Kp(2)=Kp(1)
C.
随温度的升高而增大
D.
O 2 气的平衡压力与计量方程的写法无关
【简答题】??B Not many years ago,a wealthy and rather strange old mall named Johnson lived alone in a village in the south of England.He had made a lot of money in trading with foreign countries. When he was se...
【简答题】Not many years ago, a wealthy and rather strange old man named Johnson lived alone in a village in the south of England. He had made a lot of money in trading with foreign countries. When he was seven...
【简答题】Not many years ago, a rich and rather strange old man called Johnson lived alone in a village in England. He 26__________ (make) lots of money in doing business with foreign countries. At sy-five...
【单选题】Ag 2 O分解可用下面两个计量方程之一表示,其相应的平衡常数也一并列出:Ag 2 O(s) →0.5O 2 (g)+2Ag(s)的 ;2Ag 2 O(s) →O 2 (g)+4Ag(s)的 ;设气相为理想气体,且已知反应是吸热的,试判断下列结论正确的是( )
A.
O 2 的平衡压力与计量方程式的写法有关
B.
C.
随温度的升高而增大
相关题目：