A. values :) ethics are morals/principles that you aspire to live up to, and the closest thing to that is values.
Answer: a. 2.8
Explanation:
Given : Population mean : 
Sample size : n= 49> 30 , the sample is a large sample we use z-test.
Sample mean = 
Standard deviation : 
The test statistic for population mean is given by :-

Hence, the value of the test statistic is 2.8
The reason why consumers leave without being served because the consumers must have felt mad or upset about the service being served to them-- causing them to leave their orders or to even wait for their time for their turn of having to get their menu taken.
Because they might misuse your information