The following table represents the highest educational attainment of all adult residents in a certain town. If a resident who has completed just high school or only
some college is chosen at random, what is the probability that they are under age 40?
Round your answer to the nearest thousandth.
Age 20-29 Age 30-39 Age 40-49 Age 50 & over Total
1351
692
417
1933
4393
1247
1816
522
1167
4752
High school only
Some college
Bachelor's degree
Master's degree
649
863
1088
2018
4618
647
931
731
1113
3422
Total
3894
4302
2758
6231
17185

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