The card lists the science test scores of Class $7B$ in stem-and-leaf form. What is the median score?

The scores in order are 42, 47, 50, 53, 53, 58, 61, 64, 69, 75, 76 — 11 values, so the median is the 6th: 58. 53 is the mode; 50 and 61 come from looking at the middle stems instead of counting to the middle score.