1. The mean and standard deviation of the scores of a random sample of 45 Grade 10 students who took the final test are calculated to be 76 and 12.5, respectively. a. Find the 95% confidence interval for the mean of the entire grade 10 students. b. Find the lower and upper confidence limits. 2. A random sample of n = 15 data from the normal distribution with unknown variance produced x = 23.7 and s² = 2.89. a. Find a 98% confidence interval for the population mean b. Interpret the interval 3. The following were scores in a mathematics test selected by a teacher from all the test scores of

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