Answer:
9
Step-by-step explanation:
Range is just the difference between the highest and lowest number. So, in this case it should be 10 - 1.
Answer: 9
Put the numbers in order
Before: 10, 4, 1, 7, 4, 6, 5, 9
After: 1, 4, 4, 5, 6, 7, 9, 10
Subtract the biggest value to the smallest value
10-1=9
Range
9