统计学期末考试试题(含答?分解 - 百度文库 ر

ݷʱ : 2024/12/26 2:34:35һ µȫĶ

?x0f1527410?f1769.94?685??111.06%?x0f0471400693.24680ṹָ=?f0

ṹ䶯Ӱָ2֣

ڹṹ仯ӵƽʶ=769.94693.24=76.70Ԫ1֣

2һӽĿ˽ڶijרϲ̶ȣѡȡ500ظϲýĿ175ˡ195%ĸʹƹϲһרĿ䷶Χ2ýĿϣƵļ5.5%жճ̶ȣ ʶt 1.96 2.58 F(t) 0.95 0.99 21n?500

p?175?0.355002֣z=1.96

ƽΪ?p?p(1?p)?2.13%2֣ n?p?z?p?1.96?0.0213=0.0422֣

øʱ̶֤Ϊ95%ʱϲһרĿΪ[30.8%39.2%]1֣ 25.5%z=

?p?p?5.5%?2.582֣F(z)=0.991֣

2.13%33.ijijƷȵijڶ(λԪ)

һ ڶ һ 16 28 45 50 2 43 71 51 4 67 142 168 51 775 105 114 ҪиòƷڶļָͬƽеֱƽ伾ڱ䶯Ҫ

3.ƷϸijijƷȵijڶϼڱʼ

λԪ

// һ ļ ϼ һ 16.00 2.00 4.00 51.00 73.00 ڶ 28.00 4.30 6.70 77.50 116.50 45.00 7.10 14.20 105.00 171.30 50.00 5.10 16.80 114.00 185.90 ͬϼ ͬƽ ڱʣ% 139.00 18.50 41.70 347.50 546.70 34.75 4.625 10.425 86.875 136.68 34.16875 101.70 13.54 30.51 254.25 400.00 һȵļָΪ11.70%2֣ ڶȵļָΪ13.54%2֣ ȵļָΪ30.51%2֣ ļȵļָΪ254.25%2֣

ϱпԿиòƷijڶ䶯ֳȽԵļڲһ굱УһȺ͵ļdzرǵļȴﵽȫߵ㣬ָΪ25425ڶȺ͵dzڵڶȫ͵㣬ָΪ1354ҵӦݸòƷijڼڱ䶯֯رҪעΪһȺ͵ļȵij׼ûԴ2֣

4ͬʱμͳѧγ̵IJԣװƽɼΪ70֣׼Ϊ9֣Ұijɼ£

ɼ飨֣ ѧˣ 60 2 60-70 6 70-80 25 80-90 12 90-100 5 ϼ 50 Ҫ󣺼ҰѧƽɼȽϼĸƽɼдԣ 4Ұƽɼx?Ұɼı׼

55?2?65?6?75?25?85?12?95?5?77.42֣

50(55?77.4)2?2?(65?77.4)2?6?(75?77.4)2?25?(85?77.4)2?12?(95?77.4)2?5==9.291

50֣

Ұɼı׼׼ϵΪ??װɼı׼׼ϵΪ??д

// 9.28?0.122֣ 77.49?0.12861֣Ϊ0.1286>0.12Ұƽɼ70һ ѡÿС1֣30֣

1.ijƷȼΪһļʾǣ A߶ B.߶ C.߶ D.ȳ߶ 2.Ϊ˽ҹҵľͨõĵ鷽ʽΪ A.ղ B. C.ص D.͵

3.ijУȡ300ͬѧԵƽѣµ鷽еõвܶȫУͬѧƽѽйƵǣ

A.ȫУͬѧȡ300ͬѧԳȡͬѧе飻

B.ȫУȡ75ᣬеȫ4ͬѧе飻 C.ѽͬѧΪߡСΣÿε䣻 D.ѧУݺͼݸ150ͬѧе顣 4.ָУʱָǣ

A.GDP B.Ʒܶ C.ҵ˿ D.Ͷܶ

5.ijʡнг󣬵õе˾֧Ϊ35000ԪΪ20000Ԫ׼Ϊ3600ԪΪ2500Ԫе˾֧Ĵԣ A.д B.סһ C.д D.޷ȷ 6.Уȷǣ

A.һУΨһ (˫) B.ƫֲУСھֵλ

C.ڶࡢࡢ߶ݣһ㶼 D.dzָıֵ

7.һγɵķֲУһֵΪ

루Ԫ 2000 20004000 40006000 60008000 10000 ϼ Ƶˣ 10 40 80 40 10 200 800010000 20

A.11000 B.12500 C.14000 D.޷ 8.ڵ7УԸݷֲмǣ A.40 B.80 C.5000 D.5250

9.е鷽ʽУܴڴǣ A.ص B.ͷ C.ղ D.

10.ڳУҪʹƽС1/4Ӧã A.ӵ16 B.3 C.7/4 7/9 11.ijƤЬ12·ƤЬļڱΪ110%˵ A.ó B.óڵ C.1110% D.11·110%

12.ƽ֮һƽֵ֮ͣ

A.0 B.С C.0 D.С0 13.ijҵֲƷָһ֣

A.ָָ B.ָָ C.ָ D.ָ̬

14.ij̵Ϊ500ʱ۳ɱΪ10000Ԫй̶۳ɱΪ2000Ԫݴ˿ɼ

// ۳ɱԻع鷽Ϊ

?=2000+20x B.y?=2000+24x C. y?=2000+16x D. y?=2000+4x A.y15.XtΪơڱ䶯ѭ䶯Ͳ䶯¶ʱУMtΪе12ƶƽУXt/MtеijɷΪ

A Bڱ䶯 Cѭ䶯 D޷ȷ 16.ֵУӰխز Aˮƽ Bֵ C׼? Dn

17.X1,K,XnǴXȡͳЧĹǣ

AX BX1 C(X1?X2)/2 D(X1?X2?Xn)/3

18.ˮƽǣͬĻұֻܹƷ88%»ȼ۸ָΪ

A112% B113.64% C122.24% D116.68%

19.ijҵƷ۶Եļڱ䶯һȵļڱΪ102%48%110%ɴ˿֪ҵһвƷļǣ

Aһ Bڶ C Dļ

20.ӱ׼ֲ̬ȡnͳɶΪ1?ֲǣ

21n222222A?X B(?Xi) C(X1?X2)/2 D X1?X2?Xn

ni?1i?12in21.ֲ̬X:N(?,?)в֪гȡΪn˵ȷǣ

2?(Xi?1ni??)2ɶΪn?2ֲ

BͳXӾֵΪ0׼Ϊ?ֲ̬ Cͳn(X??)/?ӱ׼ֲ̬

?(Xi?1ni?X)2ɶΪ(n?1)?2ֲ

22.֪XͨY֮ڸعϵֱΪԱĻع鷽У϶ǣ

AY?28?0.68X BY?100?0.8X

CY?132?0.63X DY?45?0.25X

23. ̵ijѡһľ飬óҲƷ̵Ϊ˱Ʒм飬˵ȷǣ

A .ԭƷϸ B.Ʒϸ C .ԭƷϸ D.ü׷һ 24.ƽϵ?Խ

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