A pediatrician obtains the heights of her 200 3-years-old female patients. The heights one approximately. Normally distributed, with 38.72 inches and standard deviation 3.17 inches. Use the normal model to determinate:
1)The population of the 3-years old females that have a height less than 35 inches.
2) find the probability that a randomly selected 3-year old girl is between 35 and 40 inches tall.
3) fiend the heights of a 3 year old girl at the 20 percentile

Help me PLEASE :(