According to the lecture video of "Listening Skills and Public Speaking," since the 1990s, what is the average in minutes among people in terms of the amount of time that a person will "attend" to a message with an attention span before the person will get weary and lose focus in tracking a message? The average attention-span is for a range of how many minutes? Group of answer choices 15 to 13 minutes 14 to 12 minutes 11 to 9 minutes 10 to 8 minutes 7 to 5 minutes