Step 1: Understanding what is measured.
The question involves measurement of attitude, opinion, and perception, which are subjective psychological or social responses.
Step 2: Role of Likert scale.
The Likert scale is specifically designed to measure opinions and attitudes, typically through a series of statements with options like:
- Strongly Agree
- Agree
- Neutral
- Disagree
- Strongly Disagree
Step 3: Why other options are wrong.
- Ratio scale: Used for absolute measurements (e.g., length, weight, time). Not for perceptions.
- Richter scale: Used for measuring earthquake intensity.
- Armstrong scale: Not a recognized scale for opinion/perception.
Thus, the correct scale is the Likert scale.
\[
\boxed{\text{Likert scale}}
\]
Reading in the staff stationed at P measured by a dumpy level is 3.5 m. The dumpy level is stationed at Q. The Reference Level (RL) at point P is 96.5 m and the height of the dumpy level is 1.25 m. The RL at point Q is \(\underline{\hspace{1cm}}\) m.

P and Q play chess frequently against each other. Of these matches, P has won 80% of the matches, drawn 15% of the matches, and lost 5% of the matches.
If they play 3 more matches, what is the probability of P winning exactly 2 of these 3 matches?