The following table represents the highest educational attainment of all adult residents in a certain town. If a resident who is under 40 years old is chosen at random, what is the probability that they have completed a bachelor's degree and no more? Round your answer to the nearest thousandth.
Age 20-29 Age 30-39 Age 40-49 Age 50 & over Total
High school only 1161 447 748 1146 3502
Some college 1423 1364 1493 2838 7118
Bachelor's degree 679 1337 955 2483 5454
Master's degree 330 324 559 949 2162
Total 3593 3472 3755 7416 18236