Scores of an iq test have a bell shaped distribution and a standard deviation of 18. what percent of people have an iq score between 46 and 154? what percent of people has an iq score less than 64 or greater than 136? what percent of people has an iq score greater than 136?

Gravel is being dumped from a conveyor belt at a rate of 25 ft3/min, and its coarseness is such that it forms a pile in the shape of a cone whose base diameter and height are always equal. how fast is the height of the pile increasing when the pile is 14 ft high? (round your answer to two decimal places.) ft/min