Mr. Nguyen graded a set of tests for his math class. Here are the results in order from lowest to highest:
$50, 55, 57, 60, 62, 65, 78, 80, 82, 85, 88, 89, 90, 91, 93, 95, 95, 96, 98, 99$

1. Create a stem-and-leaf plot for his class grades.

   Hint (a):

   To review stem-and-leaf plots, refer to the Math Notes box in Lesson 1.3.1.

2. Find the mean for his class.

   Hint (b):

   See the Math Notes box in Lesson 1.3.3.

3. Find the median score for his class. How many students scored above this score? How many scored below it?

   Answer (c):

   The median score in Mr. Nguyen is $86.5$.
   Can you find how many scores are above and below the median?