Question

the table summarizes members of a local organization by age and whether they live north or south of center st. if a member of the organization is selected at random, what is the probability that the selected member is at least 45 years old?
a $\frac{30}{135}$
b $\frac{35}{135}$
c $\frac{100}{135}$
d $\frac{105}{135}$

the table:

	live north of center st.	live south of center st.	total
at least 45 years old	17	88	105
total	35	100	135

Explanation:

Step1: Identify total members

Total members = $135$

Step2: Identify target group size

Members at least 45 years old = $105$

Step3: Calculate probability

Probability = $\frac{\text{Target group size}}{\text{Total members}} = \frac{105}{135}$

Answer:

D. $\frac{105}{135}$