When calculating median we first need to put the numbers in order from lowest to highest
so we have 15, 72, 98, 110, 119, 119, 123, 142, 164, 178
The median is the middle data point. Since we have 10 numbers there is no exact middle point so we take the two middle points which are both 119, add them together and divide by 2. Because both numbers are the same we get 119 as the median.