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The median is 50, the middle number when they are listed in order.
A lower quartile for a set of four observations is not a meaningful concept.
45, 46, 47, 48, 49, 50, 51, 52, 53, 54 Ten of them.
Whole numbers: 45, 46, 47, 48, 49, 50, 51, 52, 53, 54
No, 51 is not prime. 47 and 53 are equidistant from 50.