Yes.
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Yes, 9 and 16 are relatively prime. They do not have any prime factors in common.
Two numbers are said to be co-primes if they do not share any common divisor except for 1. For example, 9 and 10 are co-primes. Number 9 has factors 1,3,9 and 10 has 1,2,5,10. Only 1 is common. So, these two are co-prime numbers.
29 is prime, all the others in the list are composite.
All numbers not divisible by 3 or 9 are relatively prime to 9. This would include 1, 2, 4, 5, 7, 8, 10, 11, 13, 14, 16, 17, etc.
The prime numbers from one to nine are 2, 3, 5, and 7. There are nine numbers from one to nine. The probability is 4 (the number of prime numbers) over 9 (the total number of numbers). Therefore, the probability of choosing a prime number is 4/9 or about 44 percent.