Scores on a certain nationwide college entrance examination follows a normal distribution with a mean of 500 and a standard deviation of 100. What should be the limit if only the top 15% are to be eligible?

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?