The ROUND function limits your numbers to 2 decimal places and is causing the inaccuracy. Change the round functions to use 3 decimal places to add precision.
Then change the TEXT function for the seconds part to output the values as 00.0.

Do you use a spreadsheet like Microsoft's Excel? Have you ever wanted to link out to a non excel file on your computer or network drive? This is the way I found to do it!

The viewer will learn how to use the =DISCRINV command to create a discrete random variable, use this command to model a set of probabilities and outcomes in a Monte Carlo simulation, and learn how to find the standard deviation of a set of probabilâ€¦