Marc wants to qualify for the 200-meter dash at the school championship. In order to qualify, his mean running time for 5 races must be no greater than 22.8 seconds. A list of Marc's running times, in seconds, for his first 4 races is shown.

23.1, 23.2, 22.8, 21.9
Question
What is the maximum running time, in seconds, Marc can have in his last race in order to qualify for the championship? Round the answer to the nearest tenth. Enter the answer in the box.
Response area with 1 text input box