Thanks! that was helpful. However, I feel like there was a logic error in the design of the questions/assignment but I can be wrong, sorry if I am.
It says, Find the five customers with the highest number of transactions. Which is easy to do with the sample tool but there is a tie between the last 7 out of the top first 10 customers.
There need to be a random selection of 2 customers between the last 7. This last step is a must to ensure a fair selection/representation of data.