Science test results

This task is about completing a stem-and-leaf graph.

The scores of 28 students in a science test were:

2, 3, 6, 7, 8, 9, 10, 10, 11, 11, 12, 12, 13, 13, 13, 14, 16, 17, 19, 21, 22, 22, 24, 25, 26, 27, 27, 28 

a) In the box below, draw a stem and leaf graph to show these results. 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
b)
 
What is the most common score? __________
 
c) How many children scored from 10 to 19? __________
 
d) Subtract the lowest score from the highest score. The answer is __________
 
e) The spread of scores from the highest to lowest is called the __________