Big Babies: A public health organization reports that 19% of baby boys 6 - 8 months old in the United States weigh more than 20 pounds. A sample of 18- babies is studied. OO Part 1 of 2 (a) What is the mean number who weigh more than 20 pounds in a sample of 18 babies aged 6 - 8 months? Round the answer to two decimal places. The mean number who weigh more than 20 pounds is X olo Part 2 of 2 (b) What is the standard deviation of the number who weigh more than 20 pounds in a sample of 18 babies aged 6 - 8 months? Round the answer to four decimal places. The standard deviation of the number who weigh more than 20 pounds is X