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Obtain the Probability Distribution of the Random Variable (1,1)(1,2)(1,3)(1,4)(1,5)(1,6)( 1,1 ) ( 1,2 ) ( 1,3 ) ( 1,4 ) ( 1,5 ) ( 1,6 )

Question 68

Multiple Choice

Obtain the probability distribution of the random variable.
-When two balanced dice are rolled, 36 equally likely outcomes are possible as shown below. (1,1) (1,2) (1,3) (1,4) (1,5) (1,6) ( 1,1 ) ( 1,2 ) ( 1,3 ) ( 1,4 ) ( 1,5 ) ( 1,6 )
(2,1) (2,2) (2,3) (2,4) (2,5) (2,6) ( 2,1 ) ( 2,2 ) ( 2,3 ) ( 2,4 ) ( 2,5 ) ( 2,6 )
(3,1) (3,2) (3,3) (3,4) (3,5) (3,6) ( 3,1 ) ( 3,2 ) ( 3,3 ) ( 3,4 ) ( 3,5 ) ( 3,6 )
(4,1) (4,2) (4,3) (4,4) (4,5) (4,6) ( 4,1 ) ( 4,2 ) ( 4,3 ) ( 4,4 ) ( 4,5 ) ( 4,6 )
(5,1) (5,2) (5,3) (5,4) (5,5) (5,6) ( 5,1 ) ( 5,2 ) ( 5,3 ) ( 5,4 ) ( 5,5 ) ( 5,6 )
(6,1) (6,2) (6,3) (6,4) (6,5) (6,6) ( 6,1 ) ( 6,2 ) ( 6,3 ) ( 6,4 ) ( 6,5 ) ( 6,6 )

Let X X denote the product of the two numbers. Find the probability distribution of X X . Leave your probabilities in fraction form.


A)
xP(X=x) xP(X=x) 21/18101/1231/18121/941/12151/1251/18181/1261/9201/1281/18241/12301/18\begin{array} { r | r r | r } \mathrm { x } & \mathrm { P } ( \mathrm { X } = \mathrm { x } ) & \mathrm { x } & \mathrm { P } ( \mathrm { X } = \mathrm { x } ) \\\hline 2 & 1 / 18 & 10 & 1 / 12 \\3 & 1 / 18 & 12 & 1 / 9 \\4 & 1 / 12 & 15 & 1 / 12 \\5 & 1 / 18 & 18 & 1 / 12 \\6 & 1 / 9 & 20 & 1 / 12 \\8 & 1 / 18 & 24 & 1 / 12 \\& & 30 & 1 / 18\end{array}

B)
xP(X=x) 11/1821/1831/1841/1851/1861/1881/1891/18101/18\begin{array}{r|r}\mathrm{x} & \mathrm{P}(\mathrm{X}=\mathrm{x}) \\\hline 1 & 1 / 18 \\2 & 1 / 18 \\3 & 1 / 18 \\4 & 1 / 18 \\5 & 1 / 18 \\6 & 1 / 18 \\8 & 1 / 18 \\9 & 1 / 18 \\10 & 1 / 18\end{array}


xP(X=x) 121/18151/18161/18181/18201/18241/18251/18301/18361/18\begin{array}{r|r}\mathrm{x} & \mathrm{P}(\mathrm{X}=\mathrm{x}) \\\hline 12 & 1 / 18 \\15 & 1 / 18 \\16 & 1 / 18 \\18 & 1 / 18 \\20 & 1 / 18 \\24 & 1 / 18 \\25 & 1 / 18 \\30 & 1 / 18 \\36 & 1 / 18\end{array}



C)
xP(X=x) xP(X=x) 11/36121/921/18151/1831/18161/3641/12181/1851/18201/1861/9241/1881/18251/3691/36301/18101/18361/36\begin{array}{r|rr|r}\mathrm{x} & \mathrm{P}(\mathrm{X}=\mathrm{x}) & \mathrm{x} & \mathrm{P}(\mathrm{X}=\mathrm{x}) \\\hline 1 & 1 / 36 & 12 & 1 / 9 \\2 & 1 / 18 & 15 & 1 / 18 \\3 & 1 / 18 & 16 & 1 / 36 \\4 & 1 / 12 & 18 & 1 / 18 \\5 & 1 / 18 & 20 & 1 / 18 \\6 & 1 / 9 & 24 & 1 / 18 \\8 & 1 / 18 & 25 & 1 / 36 \\9 & 1 / 36 & 30 & 1 / 18 \\10 & 1 / 18 & 36 & 1 / 36\end{array}


D)
xP(X=x) 21/3631/1841/1251/965/36\begin{array}{r|r}\mathrm{x} & \mathrm{P}(\mathrm{X}=\mathrm{x}) \\\hline 2 & 1 / 36 \\3 & 1 / 18 \\4 & 1 / 12 \\5 & 1 / 9 \\6 & 5 / 36\end{array}


xP(X=x) 71/685/3691/9101/12111/18121/36\begin{array}{r|r}\mathrm{x} & \mathrm{P}(\mathrm{X}=\mathrm{x}) \\\hline 7 & 1 / 6 \\8 & 5 / 36 \\9 & 1 / 9 \\10 & 1 / 12 \\11 & 1 / 18 \\12 & 1 / 36\end{array}

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