Companies who design furniture for elementary school classrooms produce variety of sizes for kids of different ages. Assume the heights of kindergarten children can be stated by Nnormal model with mean of 39.2 inches and standard deviation of 1.9 inches.
a) What fraction of kindergarten kids should the company expect to be less than 35 inches tall?
b) In what height interval should the company expect to find the middle 70% of kindergarteners?
c) At least how tall are the biggest 20% of kindergarteners?