参考答案:B
关于直方图应用,回答下述问题。
若样本量n=100,组数可分为()。
[解析] 根据直方图分组原则,当样本量n在50~100的时候,推荐的组数为6~10;当样本量n在101~250的时候,推荐的组数为7~12;当样本量n在250以上的时候,推荐的组数为10~
第34题: [单项选择]{{B}}Passage One
Questions 26 to 28 are based on the passage you have just heard.
{{/B}}
A. They stare at the walls.
B. They collect stamps.
C. They attend evening classes.
D. They do whatever they are interested in.
参考答案:D
答案解析:[听力原文]
How does the couple spend their evenings
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