Median is defined as?

• A. The middle score of a set of ordered observations.
• B. The mean of the first and last observations.
• C. The most frequent value.
• D. The sum of all observations divided by N.

Answer: (A)

The median is the middle value of a data set when the values are arranged in order from smallest to largest. If there’s an odd number of observations, the median is the exact middle value; if there’s an even number, the median is the average of the two central values. For example, with 1, 2, 3, 4, 5 the median is 3, and with 1, 2, 3, 4, 5, 6 the median is (3 + 4) / 2 = 3.5. The other options describe different statistics: the mean would be the sum of all values divided by N, and the mode is the most frequent value.