常用钢丝绳一般为6 X 19、6 X 37、6 X 61三种。（)

独立重复地投掷一颗均匀的骰子，直到出现6点就停止投掷，设X表示投掷骰子的次数，则X的分布列是______________. A: X123456P1/61/61/61/61/61/6 B: X123456…P1/61/61/61/61/61/6… C: X123…k…P[img=9x43]1803da13460ecf5.png[/img][img=36x43]1803da134eadb99.png[/img][img=57x43]1803da135709664.png[/img]…[img=58x43]1803da135e5a076.png[/img]… D: X123…k…P[img=9x43]1803da13671cd55.png[/img][img=36x43]1803da13703c21c.png[/img][img=57x43]1803da1378489ec.png[/img]…[img=58x43]1803da13822269c.png[/img]…

独立重复地投掷一颗均匀的骰子，直到出现6点就停止投掷，设X表示投掷骰子的次数，则X的分布列是______________. A: X123456P1/61/61/61/61/61/6 B: X123456…P1/61/61/61/61/61/6… C: X123…k…P[img=9x43]1803573572a7b80.png[/img][img=36x43]180357357af3976.png[/img][img=57x43]180357358399321.png[/img]…[img=58x43]180357358bf0f84.png[/img]… D: X123…k…P[img=9x43]180357359488348.png[/img][img=36x43]180357359c7d68a.png[/img][img=57x43]18035735a57969a.png[/img]…[img=58x43]18035735ae0e3f4.png[/img]…

独立重复地投掷一颗均匀的骰子，直到出现6点就停止投掷，设X表示投掷骰子的次数，则X的分布列是______________. A: X123456P1/61/61/61/61/61/6 B: X123456…P1/61/61/61/61/61/6… C: X123…k…P[img=9x43]1803da175d21bb3.png[/img][img=36x43]1803da176510759.png[/img][img=57x43]1803da176e34ee6.png[/img]…[img=58x43]1803da177747ce7.png[/img]… D: X123…k…P[img=9x43]1803da177fbaa74.png[/img][img=36x43]1803da17890c39f.png[/img][img=57x43]1803da1792a9c56.png[/img]…[img=58x43]1803da179bd7a28.png[/img]…

设二维随机变量(X,Y)的联合密度函数为[img=313x61]1803279077fe44b.png[/img]则常数A=( ) A: 1 B: 2 C: 3 D: 6

设二维随机变量(X,Y)的联合密度函数为[img=313x61]1803573e92875b2.png[/img]则常数A=( ) A: 1 B: 2 C: 3 D: 6

设二维随机变量(X,Y)的联合密度函数为[img=313x61]180338108f2b6ec.png[/img]则常数A=( ) A: 1 B: 2 C: 3 D: 6

设二维随机变量(X,Y)的联合密度函数为[img=313x61]1803da283c8f8e2.png[/img]则常数A=( ) A: 1 B: 2 C: 3 D: 6

‍设二维随机变量(X,Y)的联合密度函数为[img=313x61]1803da292c01976.png[/img]则常数A=( )‍‍‍ A: 1 B: 2 C: 3 D: 6

‍设二维随机变量（X，Y)的联合密度函数为[img=313x61]1803da28ccd5c4c.png[/img]，则常数A=___.‌ A: 1 B: 2 C: 3 D: 6