I am not able to do this correctly.

Ariana measured 38 randomly sampled the amount of money that one-person households spend weekly on take-out meals in Memphis. The sample had a mean of 54 dollars. Compute a 90% confidence interval using this sample. Assume the population standard deviation is 6.9 dollars. Use z=1.645 in your calculations.

Show all formulas used, work and steps. Be sure to define your variables.

Give your answer rounded to two decimal places.

Interpret your answer in a complete sentence within the context of the problem.