Answer:
The range of the grades is 9
Step-by-step explanation:
Given:
7, 8, 6, 12, 10, 12, 9, 12, 11, 8, 15, 9, 14
To find:
the range of the graded
The range = Highest number - Lowest number
To get the highest and lowest number, we need to re-arrange the numbers in either ascending or dese order:
6, 7, 8, 8, 9, 9, 10, 11, 12, 12, 12, 14, 15
From the list above, lowest = 6 and highest = 15
Range = 15 - 6
Range = 9