Hello, thank you for taking the time to post your question!
The general approach that you want to use to set up a confidence interval is taking
Confidence Interval = x-bar +/- critical value * (standard deviation / sqrt(n))
In the information in the question you’re given
x-bar = 41.5
n = 16
critical value = 1.96 for a 95% confidence level
the value that you’re missing though is the standard deviation … did it give you any details related to that as part of the question?
