1. Researchers are interested to estimate the mean cholesterol level of a particular variety of monkey. Researchers would like their estimate within 1 mg/dl of the monkey's blood at 99 %confidence level. Previous study suggests a standard deviation of 5.5 mg/dl . Obtaining monkeys is expensive and time consuming. What is the minimum number of monkeys would they need to generate satisfactory estimate?

2.Mr. Velasco wanted to know the average weight (in kilos) of students at LA0 University. He took a random sample of 100 students and discovered that their average weight is 58 kg. The population standard deviation is 0.75 kg. Construct a confidence interval for the mean weight of students in the University.