Question

just high school or only some college is chosen at random, what is the probability that they are aged 50 or over? round your answer to the nearest thousandth.

	age 20 - 29	age 30 - 39	age 40 - 49	age 50 & over	total
some college	1167	531	1226	1485	4409
bachelors degree	1342	594	755	1116	3807
masters degree	970	454	444	1139	3007
total	4410	2792	3350	4796	15348

Explanation:

Step1: Calculate the total number of people with just high school or only some college

Add the total number of people with high school only ($4125$) and some college ($4409$):
$$4125 + 4409=8534$$

Step2: Calculate the number of people aged 50 or over with just high school or only some college

Add the number of people aged 50 or over with high school only ($1056$) and some college ($1485$):
$$1056+1485 = 2541$$

Step3: Calculate the probability

Use the formula for probability $P=\frac{\text{Number of favorable outcomes}}{\text{Total number of outcomes}}$. Here, the number of favorable outcomes is the number of people aged 50 or over with just high school or only some college ($2541$), and the total number of outcomes is the number of people with just high school or only some college ($8534$).
$$P=\frac{2541}{8534}\approx0.298$$

Answer:

$0.298$