How to solve this

> Moving to another question will save this response. Question 7 9 poin William is a waiter at Seventh Heaven Hamburgers. He wants to estimate the mean amount each group at a table leaves for a tip. A random sample of 36 tables has mean x = $9.30. Assume o is known to be $3.88. Answer the following questions to create a 90% confide interval for u, the mean amount of all group tips. A. Find the appropriate z-score or t-score (critical value). Round to 3 decimal places: B. Compute the margin of error. Do not use the dollar symbol ($). Round to 2 decimal places: C. Give the 90% confidence interval. Do not use dollar symbols ($). Use parentheses like we did in class. Write the smaller number first, the larger number second, separated by a comma. Round each number to 2 decimal places: Moving to another question will save th