Final answer:
The average rate of speech is commonly cited as 150 words per minute, which is usually comfortable for audiences. Speakers must also appropriately manage volume and pitch to effectively convey their message and engage their audience.
Step-by-step explanation:
The question regarding the average rate of speech during a lecture being 150 words per minute is generally true. The typical range of speech rate for clear and effective communication does indeed hover around 150 words per minute. This rate is often cited as a comfortable pace for listeners to follow and process spoken information. It's important, however, to vary this rate to maintain audience engagement.
Regarding volume and pitch, a speaker must balance these elements to ensure clarity and effectiveness. Volume must be appropriate to the room size and audience, and pitch variation can highlight key messages or convey emotions. While personal attributes can limit pitch variation, most people can control it to some extent to improve their speech delivery.