搜题请搜索小程序“爱下问搜题”
问题 填空题

将一个容量为m的样本分成3组，已知第一组的频数为8，第二、三组的频率为0.15和0.45，则m=______．

答案

∵第二、三组的频率为0.15和0.45

∴第一组的频率为1-0.15-0.45=0.4

∵第一组的频数为8

∴m=

8
0.4
=20

故答案为：20．

阅读理解

The Ritz-Carlton New York Battery Park
☆☆☆☆☆ (＄299 per night )
Location: No.2 West Street
About it: You can have a good view of the Statue of liberty from the 39-floor, 298 – room hotel.
Millennium Hilton
☆☆☆☆☆ (＄219 per night )
Location: 55 Church Street
About it: You can go swimming in the indoor swimming pool.
The hotel is directly across from Times Square. The hotel is on the left of the street. Times Square is on the right of the street.
Midtown East
☆☆☆☆ (＄170 per night )
Location: Between East 41st Street and East 54th Street
About it: It’s quite convenient to pay a visit to the United Nations, Grand Central Station, and so on.
Marriott New York Financial Center
☆☆☆ (＄209 per night )
Location: No.85 West Street
About it: Next to many shoppimg malls. It’s quite convenient if you want to buy things in this modern city.
小题1:Which hotel is the most expensive according to the passage?
A．Midtown East.
B．Millennium Hilton.
C．The Ritz – Carlton New York Battery Park.
D．Marriott New York Financial Center.
小题2:If you want to have a good view of the Statue of liberty, you’d better choose_____.
A．Midtown East
B．Millennium Hilton
C．Marriott New York Financial Center
D．The Ritz – Carlton New York Battery Park
小题3:Mr. Daniel spent ＄518 booking(预定) two different hotels for his two friends. The two hotels might be ________.
A．Millennium Hilton and Midtown East
B．Midtown East and The Ritz – Carlton New York Battery Park
C．The Ritz – Carlton New York Battery Park and Millennium Hilton
D．Marriott New York Financial Center and Millennium Hilton
小题4:The passage is probably from _________.
A．a guidebookB．a dictionaryC．a telephone bookD．an application form
查看答案
单项选择题

断面灰绿色，质坚硬，击碎后皮部和木部常分离的药材是( )

A．莪术
B．三七
C．续断
D．绿丝郁金
E．射干
查看答案