Definition: In this task, you are given a multiple-choice question about healthcare. Answer the question based on your information and classify your answers into '1', '2', '3', and '4'.
Input: Question: Which of the following statistics is NOT affected by outliers in a sample ?: 
 Options:  <1> Sample mean. <2> Standard deviation. <3> Variance <4> Interquartile range. <5> Rank.
