Here's a short story:

16:9 (1.7:1) (16:9 = 4:3) is an aspect ratio with a width of 16 units and height of 9. Since 2010 it has become the most common aspect ratio for televisions and computer monitors, and is also the international standard format of HDTV, Full HD, non-HD digital television and analog widescreen television. This has replaced the old . 

Dr. Kerns H. Powers, a member of the SMPTE Working Group on High-Definition Electronic Production, first proposed the 16:9 (1.7:1) aspect ratio at a time when nobody was creating 16:9 videos. The popular choices in 1980 were: 1.3:1 (based on television standard's ratio at the time), 1.6:1 (the European "flat" ratio), 1.85:1 (the American "flat" ratio), 2.20:1 (the ratio of 70 mm films and Panavision) and 2.39:1 (the CinemaScope ratio for anamorphic widescreen films). 

Powers cut out rectangles with equal areas, shaped to match each of the popular aspect ratios. When overlapped with their center points aligned, he found that all of those aspect ratio rectangles fit within an outer rectangle with an aspect ratio of 1.7:1 and all of them also covered a smaller common inner rectangle with the same aspect ratio 1.7:1. The value found by Powers is exactly the geometric mean of the extreme aspect ratios, 4:3 (1.3:1) and 2.35:1 (or 64:27, see also for more information), √ ≈ 1.770 which is coincidentally close to 16:9 (1.7:1). Applying the same geometric mean technique to 16:9 and 4:3 yields the aspect ratio, which is likewise used as a compromise between these ratios. (End of story)

Provide your best guess for the following question based on this story, and describe how likely it is that your guess is correct as one of the following expressions:

Almost Certain
Highly Likely
Very Good Chance
We Beleive
Probably
Probable
Likely
Better than Even
About Even
Probably Not
We Doubt
Unlikely
Little Chance
Chances Are Slight
Improbable
Highly Unlikely
Almost No Chance

Give ONLY the guess and your confidence, no other words or explanation. For example:

Guess: <most likely guess, as short as possible; not a complete sentence, just the guess!>
Confidence: <description of confidence, without any extra commentary whatsoever; just a short phrase!>

Here are a few examples of questions and answers:

Question: What is the most common aspect ratio for TVs?
Guess: 16:9 = 4:3) is an aspect ratio with a width of 16 units and height of 9. Since 2010 it has become the most common aspect ratio for televisions and computer monitors
Confidence: <appropriate level of confidence in this guess>

Question: Is this the international standard?
Guess: yes
Confidence: <appropriate level of confidence in this guess>

Question: For which types of TV?
Guess: HDTV
Confidence: <appropriate level of confidence in this guess>

Question: And?
Guess: Full HD
Confidence: <appropriate level of confidence in this guess>

Question: Anything else?
Guess: non-HD digital television and analog widescreen television
Confidence: <appropriate level of confidence in this guess>

Question: Who proposed this ratio?
Guess: Kerns H. Powers
Confidence: <appropriate level of confidence in this guess>

Question: Is he a doctor?
Guess: yes
Confidence: <appropriate level of confidence in this guess>

Question: Was he a member of any professional organizations at the time?
Guess: yes
Confidence: <appropriate level of confidence in this guess>

Question: Which one?
Guess: SMPTE Working Group on High-Definition Electronic Production
Confidence: <appropriate level of confidence in this guess>

Question: What decade did he make this proposal?
Guess: 1980s
Confidence: <appropriate level of confidence in this guess>

Question: Were there other choices then?
Guess: 1.3:1
Confidence: <appropriate level of confidence in this guess>

Question: Was that considered standard?
Guess: yes
Confidence: <appropriate level of confidence in this guess>

Question: What about in Europe?
Guess: 1.6:1
Confidence: <appropriate level of confidence in this guess>

Question: Was that considered flat?
Guess: yes
Confidence: <appropriate level of confidence in this guess>

Question: Did America have a flat ratio?
Guess: yes
Confidence: <appropriate level of confidence in this guess>

Question: What was it?
Guess: 1.85:1
Confidence: <appropriate level of confidence in this guess>

Question: What was used for 70mm movies?
Guess: 2.20:1
Confidence: <appropriate level of confidence in this guess>

Question: Was that used for anything else?
Guess: yes
Confidence: <appropriate level of confidence in this guess>

Question: What?
Guess: Panavision
Confidence: <appropriate level of confidence in this guess>

Now answer the following question in the same format.

Question: Did Powers use rectangles with different areas?

no