An algorithm searches a database containing 78 globin sequences. It retrieves 72 sequences, of which 65 are globins. Find its sensitivity in percent, rounded to 2 decimals.
Sensitivity is true positives divided by all actual positives. Here TP = 65 and TP + FN = 78, so sensitivity is $100(65/78)=83.33\%$. Dividing by 72 instead gives precision, which asks how many retrieved results are correct; it is not sensitivity.
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