Question: Q3. One computer exam center lost partial user profiles. There are three tests which miss the examinee's names. That is, they can not find who

Q3. One computer exam center lost partial user profiles. There are three tests which miss the examinee's names. That is, they can not find who took the test. The exam center randomly distributes the three test scores to three users. Define random variableX

Xthe number of user who receives the correct score.

1. Determine the pmf ofX

2. Find the probability that at least two users receive the correct scores.

3( Calculate the expected value and variance of random variableX

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