What is the median of the data set 30 52 68 65 69 61 68 75 85 78

A 61

B65.1

C68

D69

Median is the number in the middle when all the numbers are put in order.

Let's do that first.

30 52 61 65 68 68 69 75 78 85

Now if there's 10 numbers, 2 numbers are in the middle.

By counting in 4 on both sides, we know the two numbers are both 68, so 68 is the median.