Simulating a queue doing 100 times. Confidence level is 95% and Confidence interval is (413s,425s) for average response time.
What is standard division?
Assuming the question is instead "What is the standard deviation?"
Hint: Given a high number of samples, we can assume the graph is approx. a normal distribution. From here, we can calculate the z-score for a confidence level of 95%. Can you take it from here?
With a calculated z-score of 1.96, this means we have a graph like this
ie. The upper limit is 1.96 standard deviations from the mean. The lower limit is -1.96 standard deviations from the mean.
From here, you should be able to answer the following:
(i) What is the mean of your confidence interval? (call this x)
(ii) What is the standard deviation from the mean? ie. If 1.96 standard deviations is the difference between x and 425s, what is 1 standard deviation?
Answer i and ii and you are done. Once you understand the process, feel free to use a compact formula like 1 SD = (b-a)/(z-score) where (a,b) is your confidence interval.