<prompt> Given a list of grades, calculate the median of the list.90, 70, 80, 75, 85  <response>: The median is the middle value when the data is arranged in ascending order. To calculate the median, lets begin by arranging the given list of grades in ascending order:70, 75, 80, 85, 90In this list, the middle value is 80. This means that the median of the given list of grades is 80. 