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[在线作业] 西南大学19秋[0264] 概率论在线作业

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100分 发表于 2019-9-26 08:46:28 | 显示全部楼层 |阅读模式
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2019-9-26 08:46:28 160 0 看全部
0264 概率论
' D1 Z1 r' e' \6 ^$ }5 S1.[单选题]下列函数中,(      )可以作为连续型随机变量的分布函数.9 F# P* x3 o; j
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    1.png 2.png 3.png 4.png 5.png
( `$ y; d. s% B4 I1 A6.[单选题]设随机变量X服从二项分布 <img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSe5d2ccd3b_1440a008eec_OUL"/> ,由切比雪夫不等式有 (   ).
/ ~) A8 ^7 L+ Z' Y4 k; k" F' y6 G    A.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSe5d2ccd3b_1440a0291f9_USL&rc=QyEFx8H7XhzPN%2FHl0%2B5m%2FA%3D%3D"/>1 z3 k5 a5 }0 T$ u; ?$ w
    B.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSe5d2ccd3b_1440a02fbc6_USL&rc=QyEFx8H7XhzPN%2FHl0%2B5m%2FA%3D%3D"/>
! i. e/ W* H: ~    C.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSe5d2ccd3b_1440a035fda_USL&rc=QyEFx8H7XhzPN%2FHl0%2B5m%2FA%3D%3D"/>" Z7 M* u, e: H( ~
    D.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSe5d2ccd3b_1440a03b962_USL&rc=QyEFx8H7XhzPN%2FHl0%2B5m%2FA%3D%3D"/>0 P8 a) m4 [. b9 U  \
7.[单选题]两人相约7点到8点在某地会面,先到者等候另一人20分钟既可离去,则这两个人能会面的概率为(  ).
0 J4 ]0 s$ E" o* e; f8 \8 }    A.0! |# r  g8 J/ w6 M, U% n0 l
    B.4/91 B" L) s5 j/ P$ F7 b. X
    C.5/9
4 ~# u; }- c: A6 O$ `8 }    D.1
' p- _+ J8 L) A$ y" ^9 w' S: v2 ]8.[单选题]设随机变量X的分布列为  ! j# y3 S# _" k5 ~
<p style="text-align: center;"><img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSe5d2ccd3b_14409eb10a1_OUL"/>
( y0 A- j7 v  }/ Q则常数C=(       ).
: a/ w# x5 P" P; ^5 u0 Q    A.1, J8 A; H% _+ @2 o, L& m
    B.2/ W' a2 j# E& n; q3 I
    C.4+ z& `9 d. W% O' @% t. |1 M
    D.5
% i* c/ @+ u# m. G  @9.[单选题]设随机变量<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSe5d2ccd3b_14409d62973_OUL"/>的分布函数为
  Q% x4 R/ u6 t) |9 H. X+ A* e        <img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSe5d2ccd3b_14409d65d24_OUL"/>
1 D$ |5 n8 [" [9 t  m7 X! x
6 j  D% L/ r9 D$ L  U则其中常数为(   )。* u& B/ d% c! T: F9 W1 }& |

$ n: K: P0 Y! F7 o; b1 t0 u, g    A.A=1,B= -1
0 K- p4 V. }" @9 g- E    B.A= -1,B=1( V8 K( n7 q/ _% @0 L! F1 N
    C.A=1,B=1. V5 f% U/ J# n& h0 `* T3 E% X
    D.A=-1,B=-1% y$ N% X5 F) Q/ p. t
10.[单选题]对事件A、B,下列说法正确的是(   ).8 t2 o" K1 z# Z9 Q: @. U
    A.若A与B互不相容,则<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSe5d2ccd3b_14409d338cf_USL&rc=QyEFx8H7XhzPN%2FHl0%2B5m%2FA%3D%3D"/>也互不相容
" K8 D$ i/ B' u    B.若A与B相容,则 <img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSe5d2ccd3b_14409d3fc51_USL&rc=QyEFx8H7XhzPN%2FHl0%2B5m%2FA%3D%3D"/>也相容
& ~4 @( \) \: }! Y: d) f5 |1 f    C.若A与B互不相容,则A与B相互独立9 D) D/ d# s0 r% `. G' u
    D.A与B相互独立,则 <img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSe5d2ccd3b_14409d50d2b_USL&rc=QyEFx8H7XhzPN%2FHl0%2B5m%2FA%3D%3D"/>也相互独立
1 g' b3 w5 K: a* ]: p11.[单选题]设随机变量X服从两点分布<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSw5d2ccd3b_143faa56887_OUL"/>,其分布律为4 D2 a% q( ]5 y
           <img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSw5d2ccd3b_143faa59e0e_OUL"/>. R9 u. E9 l* K2 P$ x$ V
其中<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSw5d2ccd3b_143faa644b2_OUL"/> , 则X的特征函数为(        ).
" v) U& d& n3 K( ^) _! A4 ^0 e3 T: c4 ~# s$ J5 _$ X
    A.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSw5d2ccd3b_143faa94e36_USL&rc=QyEFx8H7XhxDxatDFYxEfA%3D%3D"/>
% L1 \5 `  `( N1 M    B.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSw5d2ccd3b_143faa9b273_USL&rc=QyEFx8H7XhxDxatDFYxEfA%3D%3D"/>% s0 C# K2 U7 h1 ]+ T
    C.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSw5d2ccd3b_143faaa1280_USL&rc=QyEFx8H7XhxDxatDFYxEfA%3D%3D"/>9 t$ {. p( j0 E: u
    D.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSw5d2ccd3b_143faaa781b_USL&rc=QyEFx8H7XhxDxatDFYxEfA%3D%3D"/>* E8 U5 B/ Q6 ]* q
12.[单选题]设随机变量<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSw5d2ccd3b_143fa9e43d8_OUL"/>服从参数为<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSw5d2ccd3b_143fa9d9d95_OUL"/>的泊松分布,则<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSw5d2ccd3b_143fa9e82b2_OUL"/>=(        )。
$ o  h1 q6 h! ?$ t+ w    A.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSw5d2ccd3b_143faa1b0bd_USL&rc=QyEFx8H7XhxDxatDFYxEfA%3D%3D"/>  ^% P' t9 f* _8 x) w1 B; t$ t$ x
    B.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSw5d2ccd3b_143faa21926_USL&rc=QyEFx8H7XhxDxatDFYxEfA%3D%3D"/>) U7 e9 R7 Z+ N8 m* t- n5 J' Y3 v- }, _
    C.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSw5d2ccd3b_143faa28570_USL&rc=QyEFx8H7XhxDxatDFYxEfA%3D%3D"/>
  L+ B6 b. ~% k3 a7 ?# f+ v    D.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSw5d2ccd3b_143faa2eb8b_USL&rc=QyEFx8H7XhxDxatDFYxEfA%3D%3D"/>
) I9 a5 D+ _/ F! o13.[单选题]设随机变量X的概率密度函数为
) X! c; l- N+ a' d4 @                 <img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSw5d2ccd3b_143fa933abd_OUL"/>
# f2 x8 y) c8 y( z
/ @3 C' d% {8 A+ G* N则随机变量<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSw5d2ccd3b_143fa93676d_OUL"/>的概率密度为(  ).
3 V. D  Q' N! ^6 f8 n0 N. T7 j    A.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSw5d2ccd3b_143fa9899b5_USL&rc=QyEFx8H7XhxDxatDFYxEfA%3D%3D"/>
: w" |( M4 B+ L$ l9 n3 O    B.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSw5d2ccd3b_143fa99a7ac_USL&rc=QyEFx8H7XhxDxatDFYxEfA%3D%3D"/>    无忧答案网 " \6 g5 d- J% t9 {% d6 u" V( h
7 }- o- I" p& u1 @' Y) R
    C.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSw5d2ccd3b_143fa9a8910_USL&rc=QyEFx8H7XhxDxatDFYxEfA%3D%3D"/>) ^# }1 s1 V0 l! i
    D.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSw5d2ccd3b_143fa9b6ccd_USL&rc=QyEFx8H7XhxDxatDFYxEfA%3D%3D"/>
7 b& z3 e+ u$ c' S14.[单选题]已知随机变量X的分布函数为: u' d6 q, A, x# M3 t% ^
        <img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSw5d2ccd3b_143fa8db717_OUL"/>
/ @$ L! N: N2 O% p7 d; e) o- `
9 E( q- T5 X& q6 u2 m则<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSw5d2ccd3b_143fa8e4aac_OUL"/>(        ).
8 i1 A7 W  J6 `# T) p    A.1/44 m  x" P7 o: S: X& ~
    B.1/2# M: O0 ^$ w! G6 Y8 E
    C.3/47 ~8 o# y/ v, g" v' ~
    D.1
% H& r: R) a; C2 C, ?' I7 ~15.[单选题]设事件A、B的概率均大于零,且A与B互为逆事件(或称为对立事件),则有(  )。
# d& S) k  k# Q: J. d7 t+ v    A.A与B相互独立$ \) F0 |2 ^$ @
    B.A与B互不相容
9 y  l* d' `" H) R8 ~# P  f    C.A与B相等
1 r% _2 G/ s" ~% u/ y& p* F2 B    D.A包含B或B包含A+ \4 g: P) L+ P' s6 P& X% n
16.[单选题]设<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoA55d2ccd3b_143d1d64a0e_OUL"/>服从二维正态分布<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoA55d2ccd3b_143d1d6c5b0_OUL"/>,<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoA55d2ccd3b_143d1d7221b_OUL"/>是<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoA55d2ccd3b_143d1d752fa_OUL"/>独立的(   ).; b; w. W) l' ^& ]. b
    A.充分但不必要条件. H; W) b; z% K; G: h. E
    B.必要但不充分条件.( o, B. x% O$ l2 J1 h) d0 `
    C.无关条件& m: `- {; l: O8 K1 O1 P  E- h+ [4 L
    D.充分且必要条件
- ]& g( y6 [$ F- j6 \17.[单选题]下列函数可以作为某个随机变量X的概率密度函数的是(    ).9 j7 s. G$ U( P
    A.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoA55d2ccd3b_143d1d1b4d5_USL&rc=QyEFx8H7XhxfL6DJhqsA8g%3D%3D"/>3 e- F( m& D$ C: w  \) \( `% {
    B.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoA55d2ccd3b_143d1d22c0e_USL&rc=QyEFx8H7XhxfL6DJhqsA8g%3D%3D"/># |1 Y' y, D2 k' r; }* E
    C.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoA55d2ccd3b_143d1d29cad_USL&rc=QyEFx8H7XhxfL6DJhqsA8g%3D%3D"/>/ J% ?9 O; K- I8 ?" k) x
    D.<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoA55d2ccd3b_143d1d332f5_USL&rc=QyEFx8H7XhxfL6DJhqsA8g%3D%3D"/>! k+ e5 Q; O9 {9 j
18.[判断题]X、Y相互独立,则X、Y必不相关.
/ j" }  L0 n+ w1 l2 E9 M# |6 ~3 p    A.正确& ]' ~) r: E7 Q
    B.错误
3 t1 S/ _! T, g19.[判断题]X~N(3,4),则P(X<3)= P(X>3).; g: h! M* Q" B  U& r' U2 @# ^
    A.正确3 i+ n- I0 G2 @# F
    B.错误
# O; v0 S; d% e! W) ^5 @20.[判断题]若X~B(3,0.2),Y~B(5,0.2),且X与Y相互独立,则X+Y~B(8,0.2)./ [: a8 S2 P$ E: j
    A.正确! u0 n4 j! J  m3 v8 Q4 Z( L
    B.错误
2 G% k9 B4 z/ p* y" d21.[判断题]每一个连续型随机变量均有方差存在。  R4 W8 r7 I/ w' W/ n; l& Q& }- K2 G
    A.正确
. ~; Q, [( Y7 k4 e# J% d4 U    B.错误
, U7 D* ]# S+ ~1 e, w22.[判断题]设<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSc5d2ccd3b_14414789a73_OUL"/>为相互独立的随机变量序列,如果数学期望 <img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSc5d2ccd3b_14414a12a58_OUL"/> 均为有限的,则序列<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSc5d2ccd3b_14414a17793_OUL"/>服从大数定律.1 I* W3 p# `, @7 l  Q
    A.正确2 r3 t; Q, O( j
    B.错误" C" _7 o/ L+ b9 M6 \  ~( E( r
23.[判断题]设<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSc5d2ccd3b_1441473980c_OUL"/>服从<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSc5d2ccd3b_14414749791_OUL"/>的均匀分布,<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSc5d2ccd3b_1441474de83_OUL"/>,则<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSo5d2ccd3b_14462ee1c16_OUL"/>的密度函数为<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSc5d2ccd3b_144147515a1_OUL"/>。5 |7 T+ A- Q- D9 G% x
    A.正确
1 \8 c( Q" k- S9 y    B.错误  }. {1 I% Q0 _7 v
24.[判断题]随机向量(X,Y)服从二元正态分布,则X的边际分布为正态分布,Y的边际分布也为正态分布.
1 v) z5 t* V/ \0 j$ k    A.正确
: k8 J) g! a; x1 p, |! O' g6 s    B.错误
2 n' P! g, q. X8 a25.[判断题]设X服从参数为 <img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSc5d2ccd3b_14414708bb9_OUL"/>的泊松分布,则<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSc5d2ccd3b_1441470c9da_OUL"/>。
% ?* r0 R2 s: F+ r8 F, a9 O    A.正确# t/ X  @: T* W- \& r
    B.错误
% B3 E. C( L/ X/ a+ y  \26.[判断题]“ABC”表示三事件A、B、C至少有一个发生.. c, k$ D, D& f9 Z- e" O( b8 }
    A.正确5 ?: G1 j! _7 }1 B
    B.错误; o0 l: ~+ K9 X2 F8 ^4 D
27.[判断题]已知随机变量 <img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSx5d2ccd3b_1440687c654_OUL"/>的联合分布、边际分布如下表
' }1 ~5 d3 }& A& `<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSk5d2ccd3b_1445c564bd8_OUL"/>             $ X% ]& B# y1 B9 m9 }5 |3 H8 ^: M
则<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSx5d2ccd3b_14406888aea_OUL"/>相互独立。9 d1 j' p$ _# U3 ^& W7 o) Q
    A.正确$ f- A8 Q- ]8 D6 d$ `
    B.错误3 r* L( A) X% g0 X4 U9 V2 P
28.[判断题]设两个相互独立的随机变量 <img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSx5d2ccd3b_14406857869_OUL"/>,<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSx5d2ccd3b_14406859c71_OUL"/>的方差分别是 4 和 2 ,则  <img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSx5d2ccd3b_1440685d7e5_OUL"/>=44。. {2 T8 K- [0 Q4 Z3 d/ y. @' w
    A.正确0 z) F. W  i4 i1 e
    B.错误: Y1 T* O) J! }8 u  ^" G9 U- R
29.[判断题]任意随机变量均存在数学期望。
( V2 a% `0 D3 b' G, Q1 v    A.正确
2 p4 {( p+ [$ r% j3 g    B.错误3 v' @" q, P5 `
30.[判断题]已知:P(A)=0.2, P(B)=0.5, P(AB)=0.1,则P(A∪B)=0.6.
! J/ ?2 P4 F3 q    A.正确
; t5 m8 |, x. J0 X, B% k    B.错误9 |: k# ^3 Y$ ]& b* }
31.[判断题]“A∪B∪C”表示三事件A、B、C至少有一个发生。
7 v$ W9 \8 g6 u! T# P( I( x    A.正确
" ^6 C, O2 ?' v+ m/ d( B9 d  B9 d    B.错误
8 X) \7 |6 w1 P5 H' U32.[判断题]特征函数<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSx5d2ccd3b_144067d8ec5_OUL"/>具有性质:<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSx5d2ccd3b_144067dc0b1_OUL"/>。# d/ n& B7 C7 q* g1 o1 V: ]
    A.正确: s; g7 L7 D! b% x" r# l5 p
    B.错误/ `" q. M+ ^$ {8 v: Y" }
33.[判断题]设X、Y是随机变量,若E(XY)=EX?EY,则X与Y相互独立.$ _3 t( j1 B" l9 n4 j' P
    A.正确
" |$ P2 R2 @" \: p: l. R    B.错误5 U; Z, n9 K/ f) c
34.[判断题]从一堆产品中任意抽出三件进行检查,事件A表示“抽到的三个产品中合格品不少于2个”,事件B表示“抽到的三个产品中废品不多于2个”,则事件A与B是互为对立的事件。2 Q" t2 n; [# r
    A.正确
' `& {% X2 P! y; E) I# w, j    B.错误5 M6 f% k. ]7 R6 [9 q
35.[判断题]X为随机变量,a,b是不为零的常数,则D(aX+b)=aDX+b.4 S; ^' |: f1 w: O/ \, _) m
    A.正确% p: X2 L' b  T. I2 D
    B.错误
. x0 O. x/ O" J: k1 F36.[判断题]X为随机变量,a,b是不为零的常数,则E(aX+b)=aEX+b.
+ K( h9 `' f2 `, s- s3 s    A.正确
8 c0 ?/ t4 {% L" Y8 H% S    B.错误
; U  ]9 k( b8 g37.[判断题]"三事件A、B、C至少有一个发生"表示为“A∪B∪C”.
4 ^% V: n5 ^2 E  W" n    A.正确
. E% Q4 V' {: @; H: x    B.错误
6 n) N7 F' V! N6 q3 W9 F38.[判断题]随机变量X服从二项分布b (n , p) , 当n充分大时,由中心极限定理,X近似服从正态分布N(np,np(1-p)).
) M! m) m, a7 ~    A.正确$ }( ^$ I3 @/ V' W! V
    B.错误! ^: ~3 ?$ J# X( P0 ]
39.[判断题]设A、B为二事件,则A—B=A—AB.
4 I! s# q8 e8 m+ l& E    A.正确& `2 X/ J' y- l; L+ T/ y
    B.错误
$ |$ \3 ~+ |( \: V5 T40.[判断题]n个相互独立的随机变量之积的特征函数等于它们特征函数的乘积。
4 v3 y7 [2 v/ h" _& i3 F* H    A.正确
6 U6 J5 ~* u2 {- ~# k# J; K    B.错误
1 s5 B) T! O( E! J: p! B41.[判断题]一批产品有10件正品,3件次品,现有放回的抽取,每次取一件,直到取得正品为止,假定每件产品被取到的机会相同,用随机变量 <img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSz5d2ccd3b_143f6a7be4a_OUL"/>表示取到正品时的抽取次数,则<img src="http://fs.eduwest.com/filesys/image.jsp?fc=00quoSz5d2ccd3b_143f6a7fc8e_OUL"/>服从几何分布。! [: a8 }& P; f# r
    A.正确
3 Y: ~8 I& l1 H2 N% X3 H    B.错误+ ~+ m! M, i* Z6 b+ |( J# M
42.[判断题]设A、B、C为三事件,若满足:P(AB)=P(A)P(B),P(AC)=P(A)P(C),P(BC)=P(B)P(C),则事件A、B、C必然相互独立.
1 l4 |. E: T; Q! Z6 H- Z7 v9 e    A.正确
$ u- u$ c4 p7 y% D# r" V    B.错误- P) q5 I" r$ K+ A
43.[问答题]<img src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2019/09/17/201909171568685443257063553.png" title="201909171568685443257063553.png" alt="201912A19.png"/>
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9 t, j. V/ f! T6 S" M4 N' i& d    A.
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9 E0 t0 s' P% g- e    A.
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2 S# T8 f* a! @: l% F6 o# E    A.
( U' N7 `0 F3 R/ g. s49.[问答题]<img src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2019/09/17/201909171568685628120001176.png" title="201909171568685628120001176.png" alt="201912A27.png"/>
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50.[问答题]<img src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2019/09/17/201909171568685523475093024.png" title="201909171568685523475093024.png" alt="201912A21.png"/>
2 p1 r, q3 Y& p6 ^    A.
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6 V9 o; C# O! ?/ m6 D53.[问答题]<img src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2019/09/17/201909171568685295299010052.png" title="201909171568685295299010052.png" alt="201912A13.png"/>5 E" |! r3 @! e6 {
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$ N& F3 M% Y9 M. y# w58.[问答题]<img src="http://zuoye.eduwest.com/resourcefile/uploadFiles/file/questionImgs2018/2019/09/17/201909171568685052032015407.png" title="201909171568685052032015407.png" alt="201912A1.png"/>" j1 i. ]' b, a4 c5 W' Q
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