The heights of young adult females in the United States are

The heights of young adult females in the United States are said to have a population standard deviation of sigma = 2.6 inches. A sample was taken of n = 85 young adult females at BYU-I and the mean computed to be bar x = 65.4 inches. Use this information to answer questions #9-10.
   
9.    What is the margin of error for a 95% confidence interval of the population mean? Round your answer to 3 decimal places. (Example: 24.735)
   
10.    Compute the 95% confidence interval of the mean height. Round your answers to 3 decimal places and use interval notation. [Example: (42.335, 54.859)]
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Solution