Arrange Data Set: Arrange the data set in ascending order.The data set is already in ascending order: 74,84,86,87,89,91,92,98,126.
Determine Median: Determine the median of the data set.The middle term of the given data set is 89, since it's the fifth number in a list of nine.Median: 89
Identify Lower Half: Identify the lower half of the data set.The lower half includes values that are less than 89.Lower half: 74, 84, 86, 87
Calculate Lower Median: Calculate the median of the lower half of the data set.The median of (74,84,86,87) is the average of 84 and 86, which is (84+86)/2=85.First quartile: 85
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