The weights of newborn for hippopotami is approximately​ Normal, with a mean of 84 pounds and a standard deviation of 12 pounds. a. What is the probability that a newborn hippo weighs between 92 and 109 ​pounds?
b. Suppose baby hippos that weigh at the 5th percentile or less at birth are unlikely to survive. What weight corresponds with the 5th percentile for newborn​ hippos?
c. In​ 2017, a hippo was born at a particular​ zoo, 6 weeks​ premature, and weighed only 28 pounds at birth. What percentage of baby hippos are born weighing 28 pounds or​ less?