Final answer:
First-Class Mail (FCM) over 13 ounces must be mailed using Priority Mail to ensure timely delivery, with the weight measured in metric units. Certified mail offers additional proof of delivery for important documents.
Step-by-step explanation:
FCM (First-Class Mail) weighing over 13 ounces can be mailed using Priority Mail. This class of mail is suitable for heavier packages, ensuring they reach their destination efficiently.
The USPS offers various mail classes, and First-Class Mail is typically used for envelopes and lightweight packages, but when the weight exceeds 13 ounces, it is required to use Priority Mail or another appropriate class.
To ensure proper postage and avoid any delays in shipping, it's important for individuals like Jesse, who works in a mailroom, to choose the correct metric unit when weighing packages.
For heavy items like a box of 10 books and documents, kilograms or grams would be the suitable metric units for determining the weight and calculating the necessary postage.
Using certified mail is another option that provides a mailing receipt and electronic verification that an article was delivered or that a delivery attempt was made.
Certified mail is often used for important business correspondence and legal documents.