SCENARIO 15-8
Recently, a university switched to a new type of computer-based registration.The registrar is concerned with the amount of time (hours) students are spending on the computer registering under the new system.She decides to randomly select 8 students on each of the 12 days of the registration and determine the time each spends on the computer registering.The range, mean, and standard deviation of the times required to register are in the table that follows.
-Referring to SCENARIO 15-8, an X chart is to be used for the time required to register.The lower control limit for this data set is , while the upper control limit is . 
Definitions:
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