A die is tossed thrice. A success is getting 1 or 6 on a toss. The mean and the variance of number of successes [AI CBSE 1985]

\[\mu =2/3,\,\,{{\sigma }^{2}}=1\]

\[\mu =1,\,\,{{\sigma }^{2}}=2/3\]

\[\mu =2,\,\,{{\sigma }^{2}}=2/3\]

A die is tossed thrice. A success is getting 1 or 6 on a toss. The mea

1.	A die is tossed thrice. A success is getting 1 or 6 on a toss. The mean and the variance of number of successes [AI CBSE 1985]
A.	\[\mu =1,\,\,{{\sigma }^{2}}=2/3\]
B.	\[\mu =2/3,\,\,{{\sigma }^{2}}=1\]
C.	\[\mu =2,\,\,{{\sigma }^{2}}=2/3\]
D.	None of these
Answer» B. \[\mu =2/3,\,\,{{\sigma }^{2}}=1\]

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A die is tossed thrice. A success is getting 1 or 6 on a toss. The mean and the variance of number of successes [AI CBSE 1985]

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