Can someone please help with these 3 questions

23 Construct a 90% confidence interval for the true mean of a normal population if a random sample of size 40 8 from the population yields a sample mean of 75 and the population has a standard deviation of 5. 24 Tomatoes are grown in Florida for shipment to other parts of the country by the Anderson Produce Company. A random sample of 40 boxes is selected at one warehouse for weighing. The average weight for the sample is 33.5 pounds per box with a standard deviation of 2.1 pounds. Find a 90% confidence interval for the true average weight of the bozes of tomatoes. 25 An independent group of food service personnel conducted a survey on tipping practices in a large 8 metropolitan area. They collected information on the percentage of the bill left as a tip for 25 randomly selected bills. The average tip was 12.3% of the bill with a standard deviation of 2.7 %. Construct an interval to estimate the true average tip (as a percent of the bill) with 99 % confidence