把26、33、34、35、63、85、91、143分成若干组，要求每一组中任意两个数的最大公约数为1,那么最

某百货公司连续40天的商品销售额如下：(单位：万元)

41 25 29 47 38 34 30 38 43 40

46 36 45 37 37 36 45 43 33 44

35 28 46 34 30 37 44 26 38 44

42 36 37 37 49 39 42 32 36 35

要求：根据数据分组，编制频数分布表，并绘制直方图和折线图。

3．某百货公司连续40天的商品销售额如下：(单位：万元)

41 25 29 47 38 34 30 38 43 40

46 36 45 37 37 36 45 43 33 44

35 28 46 34 30 37 44 26 38 44

42 36 37 37 49 39 42 32 36 35

要求：根据数据分组，编制频数分布表，并绘制直方图和折线图。

机性购买。结果，1991年以后，随着“泡沫”的破灭，大城市地价急速下降。表1-25列出了“泡沫时期”(1990年)和“泡沫”破灭后(1995年)47个都道府县住宅用地的平均价格(1000日元/平方米)。

表1-25　住宅用地平均价格单位：1000日元/平方米 都道府县 1990年 1995年 都道府县 1990年 1995年 1.北海道 34 33 26.京都 388 186 2.青森 28 27 27.大阪 571 281 3.岩手 32 36 28.兵库 283 162 4.宫城 61 54 29.奈良 212 113 5.秋田 25 27 30.和歌山 91 74 6.山形 29 35 31.鸟取 34 37 7.福岛 37 38 32.岛根 22 26 8.茨城 69 75 33.冈山 54 55 9.枥木 65 71 34.广岛 81 74 10.群马 65 65 35.山口 38 45 11.琦玉 266 191 36.德岛 45 57 12.千叶 268 156 37.香川 67 71 13.东京 859 426 38.爱媛 59 62 14.神奈川 351 277 39.高知 46 49 15.新潟 46 50 40.福冈 64 66 16.富山 56 56 41.佐贺 26 29 17.石川 70 78 42.长崎 38 43 18.福井 57 66 43.熊本 33 41 19.山梨 56 63 44.大分 31 36 20.长野 37 46 45.宫崎 29 30 21.岐阜 61 64 46.鹿儿岛 31 35 22.静冈 129 111 47.冲绳 46 62 23.爱知 179 136 24.三重 49 53 25.滋贺 113 82

(1)计算“泡沫时期”(1990年)的方差s²、标准差s和变动系数CV。

(2)计算“泡沫”破灭后(1995年)的方差s²、标准差s和变动系数CV。

某生产车间30名工人日加工零件数(件)如下：

30 26 42 41 36 44 40 37 37 25 45 29 43

31 36 36 49 34 47 33 43 38 42 32 34 38

46 43 39 35

要求：

(1)根据以上资料分成如下几组：25～30，30～35，35～40，40～45，45～50，计算出各组的频数和频率，整理编制次数分布表。

(2)根据整理表计算工人生产该零件的平均日产量。

A.（数据来源:Wind，2012/9/28-2021/9/27，历史数据不预示未来表现。）

B.85%、26%、109%

C.21%、-5%、28%

D.61%、8%、35%

The first and smallest unit that can be discussed 【21】______ relation to language is the word. In speaking, the choice of words is 【22】______ the utmost importance. Proper selection will 【23】______ one source of 【24】______ breakdown in the communication cycle. Too 【25】______ ,careless use of words 【26】______ a meeting of the minds of the speaker and 【27】______ . The words used by the speaker may 【28】______ unfavorable reactions 【29】______ the listener 【30】______ interfere with his comprehension; hence, the transmission-reception system breaks 【31】______ .

【32】______ inaccurate or 【33】______ words may make 【34】______ difficult 【35】______ the listener to understand the 【36】______ which is being transmitted to him. The speaker who does not have specific words in his working 【37】______ may be 【38】______ to explain 【39】______ describe in a 【40】______ that can be understood by his listeners.

【21】

A．in

B．at

C．from

D．up on

种植这两种种子．设在每块土地的两部分人工管理等条件完全一样．下面给出各块土地上的单位面积产量：

土地编号i	1	2	3	4	5	6	7	8	9	10
种子A(xi)	23	35	29	42	39	29	37	34	35	28
种子B(yi)	26	39	35	40	38	24	36	27	41	27

rialized countries. The current annual marriage【21】in the United States—about 9 new marriages for every 1,000 people—is【22】higher than it is in other industrialized countries. However, marriage is【23】as widespread as it was several decades ago.【24】of American adults who are married【25】from 72 percent in 1970 to 60 percent in 2002. This does not mean that large numbers of people will remain unmarried【26】their lives. Throughout the 20th century, about 90 percent of Americans married at some【27】in their lives. Experts【28】that about the same proportion of today's young adults will eventually marry.

The timing of marriage has varied【29】over the past century. In 1995 the average age of women in the United States at the【30】of their first marriage was 25. The average age of men was about 27. Men and women in the United States marry【31】the first time at an average of five years later than people【32】in the 1950s.【33】, young adults of the 1950s married younger than did any previous【34】in U. S. history. Today's later age of marriage is【35】the age of marriage between 1890 and 1940.【36】, a greater proportion of the population was married (95 percent) during the 1950s than at any time before【37】. Experts do not agree on【38】the "marriage rush" of the late 1940s and 1950s occurred, but most social scientists believe it represented a【39】to the return of peaceful life and prosperity after 15 years of severe economic【40】and war.

(1)

A．ratio

B．rate

C．percentage

D．poll

由下表中的玻璃对，设=0，P₀=0.31和P₀允许误差|△P₀|＜0.001，试求有哪些冕牌在前或火石在前的玻璃对满足上述要求。

表 40种玻璃的n、v值 序号 名称 n v 序号 名称 n v 1 QK1 1.4704 66.80 1 KF1 1.5005 57.2 2 QK2 1.4781 65.60 2 KF2 1.5153 54.5 3 QK3 1.4874 70.00 3 KF3 1.5262 51.00 4 K1 1.4996 62.1 4 QF1 1.5480 45.9 5 K2 1.5004 66.00 5 QF2 1.5608 46.8 6 K3 1.5046 64.80 6 QF3 1.5749 41.3 7 K4 1.5080 61.00 7 QF4 1.5800 38.00 8 K5 1.5100 63.40 8 QF5 1.5820 42.00 9 K6 1.5111 60.50 9 F1 1.6031 37.9 10 K7 1.5147 60.6 10 F2 1.6128 36.9 11 K8 1.5159 56.8 11 F3 1.6164 36.6 12 K9 1.5163 64.1 12 F4 1.6199 36.3 13 K10 1.5181 58.9 13 F5 1.6242 35.9 14 K11 1.5263 60.1 14 F6 1.6248 35.6 15 K12 1.5335 55.5 15 F7 1.6361 35.4 16 BaK1 1.5302 60.5 16 BaF1 1.5480 53.9 17 BaK2 1.5399 59.7 17 BaF2 1.5696 49.4 18 BaK3 1.5467 62.8 18 BaF3 1.5795 53.9 19 BaK4 1.5524 63.3 19 BaF4 1.5826 46.5 20 BaK5 1.5606 58.3 20 BaF5 1.6055 43.9 21 BaK6 1.5638 60.8 21 BaF6 1.6076 46.1 22 BaK7 1.5688 56.00 22 BaF7 1.6140 40.0 23 BaK8 1.5724 57.5 23 BaF8 1.6259 39.1 24 BaK9 1.5774 56.4 24 ZBaF1 1.6222 53.1 25 ZK1 1.5688 62.9 25 ZBaF2 1.6395 48.3 26 ZK2 1.5831 59.3 26 ZBaF3 1.6568 51.1 27 ZK3 1.5891 61.2 27 ZBaF4 1.6641 35.4 28 ZK4 1.6088 58.9 28 ZBaF5 1.6709 47.3 29 ZK5 1.6111 55.8 29 ZBaF6 1.6935 49.2 30 ZK6 1.6126 58.3 30 ZBaF7 1.7535 37.6 31 ZK7 1.6133 60.6 31 ZF1 1.6475 33.9 32 ZK8 1.6140 55.1 32 ZF2 1.6725 32.2 33 ZK9 1.6203 60.3 33 ZF3 1.7172 29.5 34 ZK10 1.6220 56.7 34 ZF4 1.7280 28.3 35 ZK11 1.6384 55.5 35 ZF5 1.7398 28.2 36 ZK12 1.6645 54.6 36 ZF6 1.7550 27.5 37 PK1 1.5190 69.8 37 ZF7 1.8060 25.4 38 PK2 1.5486 68.1 38 TF1 1.5394 51.8 39 LaK1 1.6594 57.3 39 TF2 1.5538 48.6 40 LaK2 1.7468 50.9 40 TF3 1.6123 44.1

important for health. Eating breakfast at the 【27】______ of the day, we have all been 【28】______ , is as necessary as putting gasoline in the family car 【29】______ starting a trip.

But for many people the thought of food first in the morning is by 【30】______ pleasures. So 【31】______ all the efforts, they still take no 【32】______ Between 1978 arid 1983, the latest years for which figures are 【33】______ , the number of people who didn't have breakfast increased 【34】______ 33 percent--from 8.8 million to 11.7 million 【35】______ the Chinese-based Market Research Corporation of America.

For those who feel pain of 【36】______ about not having breakfast, 【37】______ , there is some good news. Several studies in the last few years 【38】______ that, for adults especially, there may be nothing 【39】______ with omitting breakfast. "Going 【40】______ breakfast does not affect 【41】______ "Said Arnold E. Bendoer, former professor of nutrition at Queen Elizabeth College in London, 【42】______ does giving people breakfast improves performance.

【43】______ evidence relating breakfast to better health or 【44】______ performances is surprisingly inadequate, and most of the recent work involves children, not 【45】______ "The literature," says one researcher, Dr. Ernesto Pollitt at the University of Texas, "is poor."

【26】

A．about

B．into

C．up

D．from