Question: A large Australia-owned supermarket chain has a target average processing time of 90 seconds for customers who reach a checkout in the 12 items or

A large Australia-owned supermarket chain has a target average processing time of 90 seconds for customers who reach a checkout in the "12 items or less" queue. To test that its Hobart city store is meeting this target, the processing time taken by a random sample of 50 customers in this queue is recorded. The average processing time of the sample is found to be 101 seconds with a sample standard deviation of 35 seconds.

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3. What is my goal?

2. I try to be as logical as possible

1. To understand the prerequisites for personal communication mastery.