Q. Select the outlier in the data set.74,84,86,87,89,91,92,98,126
Arrange Data Set: Arrange the data set in ascending order if it is not already.The data set is already in ascending order: 74,84,86,87,89,91,92,98,126.
Calculate IQR: Calculate the interquartile range (IQR) of the data set.First, find the first quartile (Q1) and the third quartile (Q3).Q1 is the median of the first half of the data set: (74,84,86,87), which is (84+86)/2=85.Q3 is the median of the second half of the data set: (91,92,98,126), which is (92+98)/2=95.IQR=Q3−Q1=95−85=10.