Create a dashboard based on attached historical customer service team data in any BI tool of your choice. Is this data sufficient to determine the optimal number of employees in the department? a) was the number of people sufficient for the period included in the data? Yes / No and why? b) propose the number of employees for the next year, month by month. Propose an efficiency indicator, are there employees more or less efficiency than other? Create a historical backlog of open conversations. A puzzle: there are five positive numbers. It is known that the difference between the sum of any three of them and the sum of the other two is always positive. Prove that the product of all possible ten such differences is not greater than the square of the product of these five numbers.