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5. Red blood cells have a normal lifespan of three to four months. Bilirubin is a component generated by the breakdown of hemoglobin and is irther processed in the liver. Bilirubin contains a yellow pigment buildup of bilirubin in the body due to liver malfunction gives skin a yellowish hue. Bilirubin is removed from fatal blood through placental exchanges. Once the child is born, the immature newborn liver must begin processing bilirubin. The liver is initially unable to keep up with the load of dying red blood cells. Bilirubin levels increase between days 2 and 4 after birth. Bilirubin concentrations usually fall substantially by the end of the first week. Many other factors can aggravate bilirubin concentration in blood during the rst week of life. High concentrations of bilirubin can have severely adverse effects, such as permanent hearing loss mental retardation and other forms of brain damage. The average measured bilirubin concentration in 20 newborns on day 5 was 6.6 mg/dl. If the bilirubin levels in ve-day old infants are normally distributed with a standard deviation of 4.3 mg/dl, estimate ,u by determining the 95% and 99% condence intervals for the population mean bilirubin levels