3. Find the sample size required to estimate the proportion of all college students who own an iPad.
Assume that the researcher wants to be 90% confident that the proportion from the sample is
within three percentage points of the true population proportion. Round the critical value to
three decimal places.

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