Answer: likely out of control and the cause should be investigated.
Explanation: The Mean is a term used both in Statistics, Economics, mathematics etc to describe the average of a set of numbers. The Arithmetic mean can be calculated by adding up a set of numbers and dividing the number by the frequency or the number of occurrences.
IF A MEAN IS WITHIN THE LIMITS OF A SET OF NUMBERS THE PROCESS IS SAID TO BE UNDER CONTROL WHILE IF THE MEAN IS OUTSIDE THE LIMITS OF A SET OF NUMBERS THE PROCESS IS SAID TO BE LIKELY OUT IF CONTROL AND THE ROOT CAUSE HAS TO INVESTIGATED TO ESTABLISH THE ROOT CAUSE.