Standardized tests for certain subjects, given to high school students, are scored on a scale of 1 to 5. Students who receive a 3 or higher can earn college credit. Let X represent the score on a randomly selected exam. The distribution of scores for one subject's standardized test is displayed in the histogram. A graph titled test scores has x = score on the x-axis, and probability on the y-axis. 1, 0.18; 2, 0.20; 3, 0.26; 4, 0.21; 5, 0.15. What is the shape of the distribution? skewed left skewed right uniform, approximately symmetric unimodal, approximately symmetric