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Home » A die is thrown three times. Let X be ‘the number of twos seen’. Find the expectation of X.
A die is thrown three times. Let X be ‘the number of twos seen’. Find the expectation of X.
CBSE | Class 12 | Exercise 1 | Maths | NCERT Exemplar | Probability
A die is thrown three times. Let X be ‘the number of twos seen’. Find the expectation of X.

Here, we have

    \[X\text{ }=\text{ }0,\text{ }1,\text{ }2,\text{ }3\]

[Since, die is thrown

    \[3\]

times]

And

    \[p\text{ }=\text{ }1/6,\text{ }q\text{ }=\text{ }5/6\]

Therefore, the required expression is

    \[1/2\]

.

i

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