First we have to arrange given data into ascending order,
35, 42, 51, 56, 67, 69, 72, 81, 85, 92
Given number of observations, n = 10 (even)
Therefore median = (n/2)th term + ((n + 1)/2)th term
Median = (value of 5th term + value of 6th term)/2
= (67 + 69)/2
= 68
Hence median for given data = 68