need help with d and e

According to one study, brain weights of men are normally distributed with a mean of 1.20 kg and a standard deviation of 0.14 kg. Use the data to answer . . . . . Pop Pop 1.2 d. Determine the percentage of all samples of three men that have mean brain weights within 0.1 kg of the population mean brain weight of 1.20 kg. (Round to two decimal places as needed.) e. Determine the percentage of all samples of twelve men that have mean brain weights within 0.1 kg of the population mean brain weight of 1.20 kg. (Round to two decimal places as needed.)