18 19 21 18 17 22 24 31 18 19 20 20
22 21 18 17 26 32 43 22 21 20 20 19
19 21 18 17 16 24 21 19 18 18 19 18
One of the students from the sample is randomly selected. Calculate the probability that the student is older than 21 given that his/her age is an odd number.
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