问题
单项选择题
以均数为中心呈最高值、左右完全对称的钟形曲线是()
A.二项分布
B.泊松分布
C.正态分布
D.双峰分布
E.偏态分布
答案
参考答案:C
解析:正态分布曲线是以均数为中心、左右完全对称的钟形曲线,它表示变量值出现的概率。均数的概率最高。
以均数为中心呈最高值、左右完全对称的钟形曲线是()
A.二项分布
B.泊松分布
C.正态分布
D.双峰分布
E.偏态分布
参考答案:C
解析:正态分布曲线是以均数为中心、左右完全对称的钟形曲线,它表示变量值出现的概率。均数的概率最高。
选择适当的句子补全对话,其中有两项是多余的。 | |
A: Hi, Wang Li! What time do you usually get up on weekdays? B: I always get up at about six o'clock. A: 1 How do you usually go to school? B: 2 But sometimes I go to school by bus. A: By the way, where does your mother work? B: She works in a factory. She makes shoes. A: 3 B: She usually goes to work by subway. A: Where does she have lunch? B: 4 It takes her too much time to come back home for lunch. A: Oh, 5 It's time for class. B: Let's go.
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