Final answer:
The average waiting time for a customer on hold before speaking to a representative is 25 minutes.
Step-by-step explanation:
To find the average waiting time of a customer on hold before speaking to a representative, we need to add the average time between calls and the average time spent with each customer. The average time between calls is 6 minutes with a standard deviation of 6 minutes. The average time spent with each customer is 19 minutes with a standard deviation of 28.50 minutes.
To find the total waiting time, we add the average time between calls and the average time spent with each customer: 6 minutes + 19 minutes = 25 minutes.
Therefore, on average, a customer will spend 25 minutes waiting on hold before speaking to a representative.