Free practice · numeric · medium
Practice
Calculate top-customer concentration
Customer revenues are $2,000, $1,500, $1,000, $400, $300, and $200. What percentage of total revenue comes from the top two customers?
Response-time distribution
Most tickets cluster below seven hours, with one long delay
Ordered response hours
Ticket 12 h
Ticket 23 h
Ticket 34 h
Ticket 44 h
Ticket 55 h
Ticket 65 h
Ticket 76 h
Ticket 830 h
The 30-hour observation creates a long right tail. Investigate it before deciding whether it is an error, exception, or valid rare case.