1. A particular brand of coffee contains an average of 112mg of caffeine per cup with a standard deviation of 20mg. Mikasa wants to investigate the same to estimate the true population mean caffeine content correct to within 5mg adopting 95% confidence. How many cups of the same brand of coffee does he need for a sample?
2. In a certain village, Eren wants to estimate the mean weight, in kilograms of all six-years old children to be included in a feeing program. She wants to be 99% confident that the estimate of