Some measurements have units associated with them: for example feet or metres or grams etc. But not necessarily.
yes
precise but unreliable.
5 and 6
Every tow consecutive odd or even numbers differ by two.
2 and 5 are the only prime numbers which differ by 3.
5.0
yes
Two prime numbers which differ by 2 are called "twin primes".
Apparently, women's clothes sizes are in even numbers because of standardized measurements. When you cut cloth, you can standardize the measurements.
Then they have precision but not accuracy.
A quantitAtive observation
Since the numbers differ by 2 and the GCF is 2, they are consecutive even integers. So the numbers are 6 and 8.