Problem
Mr. Ramos gave a test to his class of students. The dot plot below shows the distribution of test scores. [See figure in original PDF] Later Mr. Ramos discovered that there was a scoring error on one of the questions. He regraded the tests, awarding some of the students extra points, which increased the median test score to . What is the minimum number of students who received extra points? (Note that the median test score equals the average of the scores in the middle if the test scores are arranged in increasing order.)
Select an answer