Debugging Exercise #$3$

Jack has written a program that computes and prints the average of $10$ test scores. Here is the code for this program:

In $[25]$:The average test score is $81\mathrm{.}88888888888889$This result is slightly off, which signifies that the program likely contains an error. State what type of error this is$,$ describe how it is detected, and explain how to correct it$.$Please add your response and solution below.