Answer :

We have arranged data,


8, 9, 12, 17, x + 2, x + 4, 30, 31, 34, 39


Median = 15


Total number of data values, n = 10


Since, n is even, median will be given by




Median = The mean of 5th term and 6th term


Median = The mean of (x + 2) and (x + 4)




30 = 2x + 6


2x = 30 – 6


2x = 24



x = 12

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