Algebra-1

Question Analysis
This question tests the student's ability to find the median of a given data set. The data set must be sorted in ascending order, and the median is the average of the two middle numbers for an even number of data points.

Key Concept Explanation
The median is the middle value in a sorted data set. For an even number of data points, it is the average of the two middle numbers.

Step-by-step Solution
1. Sort the data in ascending order: 55, 60, 65, 70, 75, 80, 85, 90.
2. Identify the two middle numbers: 70 and 75.