Sensitivity analysis is unlikely to be asked in F5, and if it is then not as calculations. It is Paper F9 where it becomes important and where you can be asked calculations.
What it is is measuring what percentage change in one of the uncertain items would result in the decision being changed. So if only a small change in the variable would change the decision then we would be rather worried. If it would need a big change to change the decision then we would not be so worried.
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