The table shows the number of customers served by 3 counter crew members at a fast food outlet for 5 days in a particular week. The company emphasizes consistency and fast service at the counters. Based on the data given in the table, which of the following statements must be true?
Zaniyah’s performance for the week was very consistent but also very slow.
Yasmine’s performance every day for 5 days was always within 1 standard deviation of the mean.
Yasmine’s performance for the week was the most inconsistent.
Xenia’s performance for the week was the fastest and most consistent.
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