4. (4 pts each) Sheryl works in a law office as a paralegal, where she quickly s

Question

4. (4 pts each) Sheryl works in a law office as a paralegal, where she quickly scans hundreds of documents looking for smoking guns, a significant piece of evidence in support of their side. Occasionally she will find an oh s***, a significant piece of evidence against their side in a case. If she find either a smoking gun or an oh s***, she immediately contacts the head lawyer in the case to discuss what she found. We will assume finding a significant piece of evidence from document to document are independent events. (d) A head lawyer has promised Sheryl a gift certificate to Highlands Grill if she can find three or more smoking guns for a particular case. Assuming that the number of documents are endless, and the chances of finding a smoking gun is .00004, what is the expected number of documents Sheryl needs to scan for her math professor husband to enjoy a night out at Highlands Grill?

Explanation / Answer

Here the expected number of documents Sheryl needs to scan for her math professor husband to enjoy a night out at Highlands Grill is computed as:

= Number of documents required with smoking guns / Probability of finding a smoking gun in any document

= 3 / 0.00004

= 75000

Therefore 75,000 documents she needs to scan for her math professor husband to enjoy a night out at Highlands Grill

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