please include formulas/ explaination. need help finding the UCL and LCL

Houston North Hospital is trying to improve its image by providing a positive experience for its patients and their relatives. Part of the "image" program involves providing tasty, inviting patient meals that are also healthful. A questionnaire accompanies each meal served, asking the patient, among other things, whether he or she is satisfied or unsatisfied with the meal. A 150-patient sample of the survey results over the past 7 days yielded the following data: No. of Unsatisfied Patients Day 1 2 3 Sample Size 150 150 150 150 150 150 150 26 22 8 13 10 28 15 4 5 6 7 The control limits to include 99.73% of the random variation in meal satisfaction are: UCL = (enter your response as a number between 0 and 1, rounded to three decimal places)