A study based on a sample of size 50 reported a mean of 76 w

A study based on a sample of size 50 reported a mean of 76 with a margin of error of 12 for 90% confidence. With a sample size 50 you may use a normal approximation (Z).

Fill in the blank (Give your answers to the nearest integer):
The 90% confidence interval is: [1) _______ , 2) _______ ].

What is the excel formula?