If you are talking about mass produced bottles then the probability is very low. There would certainly be some form of quality control in the system to ensure the items fall between the tolerances required.
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probability = 2/7 to be exact, 28/97 (about 28.87%)
Approx 0.0287
6 out of 30 ie 20% or 0.2
There is only one girl out of 12 students so the probability that the girl is selected is 1/12.
That is known as a simple random sample, or SRS.