Aspinner is divided into eight equal sections. each section is either blue or yellow. the spinner was fun 40 times. it landed on a yellow section 10 times. which proportion can be used to find the number of sections, why, that could be expected to be yellow?

Concerned about campus safety, college officials want to estimate the percentage of students who carry a gun, knife, or other such weapon. how many randomly selected students must be surveyed in order to be 95 % confident that the sample percentage has a margin of error of two percentage points?