ACTIVITY #8 Estimation of Parameters Solve the following. Show the step by step process in solving. (10 points each number) 1. The mean score of a random sample of 22 student applicants who took the college entrance examination is calculated to be 76.9. The population standard deviation is known to be 27.4. Find the 99% confidence interval for the mean of the entire student applicants. 2. The number of text messages received by Sofia in one day follows a normal distribution with a mean of 15. She investigated a random sample of 30 days duration and observed the sample men of 15 and a standard deviation of 4. Construct a 99% confidence interval for the mean. 3. Margarita wants to estimate the average blood pressure of adults in a certain city with a known standard deviation of 15. If she surveys a ample of 40 adults and determined the sample mean of 110, compute a 90% confidence interval for the average blood pressure of adults. Reference