I need a check on my answer to the problem below. My answer was 1.73 +- .06
A random sample of 45 Americans consumed an average of 1.73 cups of coffee per day. Assume the variable is normally distributed with a standard deviation of .24 cups. Calculate an interval which will contain the true mean coffee consumption with 90% confidence.
Keep intermediate steps to four decimals when possible & enter your answer to two decimals.