数学题目，概率论与数理统计
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\u7b54\u6848\u662f1/2
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http://wenku.baidu.com/view/0bed6b1b6bd97f192279e9e0.html
u0.05\u662f\u6307\u6807\u51c6\u6b63\u6001\u5206\u5e03\u4e0b\uff0c\u5927\u4e8eu0.05\u7684\u6982\u7387\u7b49\u4e8e0.05\u7684\u90a3\u4e2a\u503c
\u4e5f\u5c31\u662f\u8bf4\u4e0d\u8d85\u8fc7u0.05\u7684\u6982\u7387\u7b49\u4e8e0.95
\u53ef\u4ee5\u770b\u5230\u8868\u4e2d\u7b2c\u4e00\u5217\u4e3a1.6\uff0c\u7b2c\u4e00\u884c\u4e3a0.04\u5bf9\u5e94\u7684\u503c\u662f0.9495\uff0c\u8868\u4e2d\u7b2c\u4e00\u5217\u4e3a1.6\uff0c\u7b2c\u4e00\u884c\u4e3a0.05\u5bf9\u5e94\u7684\u503c\u662f0.9505\uff0c\u4e5f\u5c31\u662fu0.0505=1.64\uff0cu0.04955=1.65
\u4e00\u822c\u5c31\u5927\u81f4\u7684\u53d6\u4e2a\u5e73\u5747\uff0c\u5f97\u5230u0.05=1.645
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绛旓細涓や釜灏忎笁瑙掑舰闈㈢Н锛1/2*22*22+1/2*23*23=506.5 鍒欑浉閬囩殑姒傜巼涓猴細锛576-506.5锛/576=12.07
绛旓細璁綛1涓哄彇鍑2鍙孩鐞,B2涓哄彇鍑轰袱鍙櫧鐞,B3涓哄彇鍑轰竴鐧戒竴绾.A涓轰粠鐩2涓彇鍑虹櫧鐞.P(A)=P(A|B1)*P(B1)+P(A|B2)*P(B2)+P(A|B3)*P(B3)P(A|B1)=5/11 P(A|B2)=7/11 P(A|B3)=6/11 P(B1)=C(5,2)/C(9,2)=10/36=5/18 P(B2)=C(4,2)/C(9,2)=1/6 P(B3)=1-1/...
绛旓細绠鍗曞垎鏋愪竴涓嬶紝绛旀濡傚浘鎵绀
绛旓細绠鍗曡绠椾竴涓嬪嵆鍙紝绛旀濡傚浘鎵绀
绛旓細闅忔満鍙橀噺X鏈嶄粠鎸囨暟鍒嗗竷锛岄偅涔堝畠鐨姒傜巼瀵嗗害鍑芥暟涓簒鈮0鏃讹紝f(x)=位e^(-位x)锛寈<0鏃讹紝f(x)=0銆傚畠鏈嶄粠鑰冩暟涓1鐨勬寚鏁板垎甯冿紝鍒櫸=1锛屽彲浠ョ畻鍑哄畠鐨鏁板鏈熸湜E(X)=1/位=1锛屽畠鐨勬柟宸瓺(X)=1/位²=1銆傜敱浜嶥(X)=E(X²)-[E(X)]²锛屽皢鏁板鏈熸湜鍜屾柟宸唬鍏ュ緱E(X²)...
绛旓細璁綳,Y鍒嗗埆鏄瘡涓汉鎽稿埌绾㈢悆鏁板拰鎵鏈変汉鍏辨懜鍒扮孩鐞冩暟锛孻=鈭慩锛屽叾涓璛1锛...锛孹n鐩镐簰鐙珛銆傚浜庢瘡涓汉鑰岃█锛孭(X=0)=3/5 * 2/4=3/10 P(X=0)=3/5 * 2/4 + 2/5 * 3/4=6/10 P(X=2)=2/5 * 1/4=1/10 E(X) = 0*0.3 + 1*0.6 + 2*0.1 = 0.8 E(X^2) = ...
绛旓細鍦ㄦ讳綋X~N(渭,未²)锛屼絾渭銆佄²鍧囨湭鐭ョ殑鎯呭舰銆傛晠锛岄噰鐢═鍒嗗竷鏉ヤ及璁℃讳綋鍙傛暟鐨勫尯闂淬偽=95%锛屸埓1-伪=5%锛(1-伪)/2=2.5%銆傗埓鍏剁疆淇″尯闂翠负锛孹'卤(S/鈭歯)t(伪/2)(n-1)銆傛湰棰樹腑锛宯=16锛寈'=2.705锛宻=0.029锛涙煡t鍒嗗竷琛紝t0.025(15)=2.1315銆傗埓缃俊鍖洪棿涓猴紝2.705...
绛旓細鍥炵瓟锛歎(-1, 1)鏍囩ず鍦ㄥ尯闂碵-1, 1]鐨勫潎鍖鍒嗗竷銆傚叾姒傜巼瀵嗗害鍑芥暟鏄痜(x)=1/[1-(-1)]=1/2銆傛墍浠ワ紝渭=鈭珄-1, 1}x(1/2)dx = 0銆傁僞2=鈭珄-1, 1}x^2(1/2)dx = 1/3銆傛媺鏅媺鏂湪绯荤粺鎬荤粨鍓嶄汉宸ヤ綔鐨勫熀纭涓婂啓鍑轰簡銆婂垎鏋愮殑姒傜巼鐞嗚銆嬶紝鏄庣‘缁欏嚭浜嗘鐜囩殑鍙ゅ吀瀹氫箟锛屽苟鍦姒傜巼璁涓紩鍏...
