help with statistical probability

Question

	Age 20-29	Age 30-39	Age 40-49	Age 50 & over	Total
High school only	1413	661	799	602	3475
Some college	2237	562	1193	1185	5177
Bachelor's degree	1062	1391	1187	1732	5372
Master's degree	408	559	234	417	1618
Total	5120	3173	3413	3936	15642

The following table represents the highest educational attainment of all adult residents in a certain town. If a resident who is aged 40-49 is chosen at random, what is the probability that they have completed a master's degree? Round your answer to the nearest thousandth.

Answer 1

This a conditional probability problem, P(B|A). The probability of completing a master's degree, given that the person is aged 40 - 49, is 234 out of 3413. 234/3413 = 0.06856.., rounds to 0.069.