Please read section 5.4 before you answer problems 5-7. 5. Suppose we know that the birth weight of babies is normally distributed with mean 3500g and standard deviation 500g. (5a). What is the probability that a baby is born with weight less than 3100g? (3 points) Hint find the z-score, and construct the standard normal distribution density curve, then shade your seeking area and find the probability from the table. (5b). If 25 newborn babies are randomly selected, what is the probability that the 25 babies are born that their mean weigh less than 3100g? (2 points) Hint find the z-score, construct the standard normal distribution density curve, shade your seeking area then find the probability