13 points! according to the current population survey, the following table summarizes probabilities for randomly selecting a full-time student in various age groups:
age 15–17 18–24 25–34 35 or older older
probability 0.007 0.573 0.260 0.160
if we randomly select a full-time student, what is the probability that he/she is 25 or older?
a. 0.260
b. 0.420
c. 0.740
d. the answer is impossible to determine from the information given.