I'm so lost on how to do this problem,

could someone take me step by step on how to solve it pleeze.

the question is construct the indicated confidence interval for the population mean.

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c= 0.95, x ( the line is supposed to be on top of the x)=31.39, s=0.8,n=82

if you could take me through the steps on how you do this I can maybe try to fiqure out how to do the next ones. Thank you