The median of 2,7,4,8,9,1 is

To find median, we need to arrange data in ascending order.

We have

1, 2, 4, 7, 8, 9

Total number of observations, n = 6 (even).

When n is even, median is found as follows.

⇒

⇒ Median = Mean of 3^rd term and 4^th term

⇒ Median = Mean of 4 and 7 [∵ from the arranged data, 3^rd term = 4 and 4^th term = 7]

⇒

⇒

⇒ Median = 5.5

Thus, option (C) is correct.