Precision refers to
a. how close a measured number is to other measured numbers
b. how close a measured number is to the calculated value
c. how close a measured number is to the true value
d. how close a measured number is to zero

Every weekday, mr. jones bikes from his home to his job. sometimes he rides along two roads, the long route that is shown by the solid lines. other times, he takes the shortcut shown by the dashed line. how many fewer kilometers does mr. jones bike when he takes the shortcut instead of the long route?