a. The new mini-laptop computers can deliver as much computing power as machines several times their size,

Question:

a. The new mini-laptop computers can deliver as much computing power as machines several times their size, but they weigh in at less than 3 l
b. How large a sample would be needed to estimate the population mean weight if the maximum error of estimate is to be 0.4 of 1 standard deviation with 95% confidence?