Final answer:
A medical assistant would typically use standard first-class mail to send a normal mammogram letter like Julia Berkley's, but may opt for certified mail for additional security and delivery confirmation.
Step-by-step explanation:
When a medical assistant needs to mail a normal mammogram letter to a patient, such as Julia Berkley, the type of postage required would depend on the urgency of the delivery and the standard practices of the medical office. For normal results that do not require immediate action, standard first-class mail can be sufficient. This is a cost-effective and commonly used method for delivering non-urgent patient correspondence. If privacy is a concern, which is often the case with medical documents, the letter can be sent with additional services like certified mail or return receipt, to ensure that the letter is delivered securely and that receipt is confirmed.