The expected frequency for the cell in row i and column j is the row i total plus the row j total, ...

The expected frequency for the cell in row i and column j is the row i total plus the row j total, all divided by n.
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Q. 2

To calculate expected profit under certainty, we need to have perfect information about which event will occur.
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Q. 3

If two events A and B are independent, the P(A and B) = P(A) + P(B).
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Q. 4

The expected value of perfect information (EVPI) is always the same as the expected opportunity loss for the best alternative. That is, EVPI = EOL.
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