Considering our linearisation, define a symbolic expression for the desired Y variable, using "T" as the symbol for average times and "n" as the symbol for number of masses. YOU MUST USE THESE SYMBOLS WITH THE SAME CAPITALISATION.

Then, print the symbolic expression and copy and paste the output of this print call directly into the input cell below without any changes. 

E.g. if the variable into which you have stored the symbolic expression is called expr_y, then add the line

print(expr_y)

to your code and copy from the terminal or console the output that this line generates and paste this into the text cell below without any editing.