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The probability is 10 percent.
If the balls are selected at random, then the probability is 12/95.
1 in 52
1 out of 3600
0.3456
1/365 = 0.00274
It depends on what the random variable is, what its domain is, what its probability distribution function is. The probability that a randomly selected random variable has a value between 40 and 60 is probably quite close to zero.
The probability of selecting a 17 (or any number for that matter) is 1/20 or .05 or 5%.
probability = 2/7 to be exact, 28/97 (about 28.87%)
random sample
When each member of the population has the same probability of being selected as a member of the sample.
The probability is approx 0.81