Your median is 260.5
Put the number set in order, since there are 10 numbers, take the middle 2 and find their average:
208,210,248,252,257,264,271,278,284,295
257+264=521
521/2 = 260.5
For future reference, if you have an even number of items in the list, the median is the middle number after the set has been put in order
