The results of a poll indicate that between 33% and 37% of the population of a town visit the library at least once a year. what is the poll’s margin of error? enter your answer in the box. ±%

The interval given was 33% to 37%

This means that subtracting the margin of error from the percentage of the population that visit the library once a year gives the lower end and adding the margin of error to the percentage of the population that visit the library once a year gives the upper end

Let x denote margin of error and y denotes the percentages of the population that visit the library once a year

we can get the following equations and solve for the values of x and y



Adding eqn1 and eqn2 to gives



Putting the value of y into any of the equations



Thus, the margin of error is


Therefore we enter 2 in the box