What is the median blood glucose concentration from the following values: 70, 75, 85, 90, 95, 100, 105, 110, 120, 120, 140, 145, 190?

To determine the median blood glucose concentration from the provided values, it is essential to first organize the data in ascending order. The values given are already sorted: 70, 75, 85, 90, 95, 100, 105, 110, 120, 120, 140, 145, and 190.

In a set of numbers, the median is defined as the middle value. To find the median in a dataset with an odd number of entries, you can identify the value located at the center position.

In this instance, there are 13 values in total. To find the median, you can use the formula for the position of the median in an ordered list, which is given by (n + 1) / 2, where n is the number of observations. Here, n is 13, so the median position is (13 + 1) / 2 = 7. The seventh value in the sorted array is 105.

Thus, in this set, the median blood glucose concentration effectively represents the central tendency of this data set, indicating that 105 is the middle value when ordered from lowest to highest, which makes it the correct answer.