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20名学生在10次试验中成功次数的频数分布如下：X012345678910f11542211201计算三个集中量指标。M=( )Mo=( )Md=( )

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假设我们要确定37个4岁孩子的数字记忆广度（在一个短暂的时间记住数字的个数）。那么这组样本的平均数字记忆广度为多少呢？X6543210f27175321

S: Good morning. ___________?C: Good morning. Would you show me some typical Chinese souvenirs? I’d like to buy a gift formy wife.S: We’ve got plenty of silk scarves and silk dresses for you to choose from.C: The dress is very nice. _ is it ?S: Fifty-five US dollars.C: It’s a little more than I expected. Could you give me a _____?S: I’d like to, but I’m afraid I can’t. You see, it’s already 5% off the regular price.C: Then I’m _ I can’t afford it.S: Well, let me ask the manager if it’s all right… I’m sorry to have kept you waiting. The best wecan do is to give you a 10% discount.C: OK. I’ll _ it .R: Good morning! Welcome to Holiday Hotel. What can I do for you?M: I have a ________ with you.R: May I have your name, please?M: Michael Han.R: Let me check. Yes, there it is. A double room for one night. Mr. Han, may I have a _ at yourpassport, please?M: OK, here you are.R: Would you please the registration form?M: All right. What’s the rate for one person per night?R: 59 dollars.M: Do you accept traveler’s checks?R: Sure. Here is the key card to room 3316. The bell-man will show you the way.M: Thanks. I will be leaving tomorrow. When shall I ____out ?R: Any time before 11:00 a.m.M: All right. I’ll remember that.

同类产品竞争者的数量与实力也影响企业的广告费用。（）

A. 对
B. 错

4位移位寄存器可寄存（）个数码

A. 2
B. 6
C. 4
D. 16