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䷶Χ2ýĿϣƵļ5.5%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 25.5%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͵ļȵijûԴ2֣
4ͬʱμͳѧγ̵IJԣװƽɼΪ70֣Ϊ9֣Ұijɼ£
ɼ飨֣ ѧˣ 60 2 60-70 6 70-80 25 80-90 12 90-100 5 ϼ 50 ҪҰѧƽɼȽϼĸƽɼдԣ 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
ҰɼıϵΪ??װɼıϵΪ??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.ijʡнгõе˾֧Ϊ35000ԪΪ20000ԪΪ3600ԪΪ2500Ԫе˾֧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 Dȷ 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.ӱֲ̬ȡnͳɶΪ1?ֲǣ
21n222222A?X B(?Xi) C(X1?X2)/2 D X1?X2?Xn
ni?1i?12in21.ֲ̬X:N(?,?)в֪гȡΪn˵ȷǣ
Aͳ
2?(Xi?1ni??)2ɶΪn?2ֲ
BͳXӾֵΪ0Ϊ?ֲ̬ Cͳn(X??)/?ӱֲ̬
Dͳ
?(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. ̵ijѡһľ飬óҲƷ̵Ϊ˱Ʒм飬˵ȷǣ
A .ԭƷϸ B.Ʒϸ C .ԭƷϸ D.üһ 24.ƽϵ?Խ
//