In a university, 30% of the students major in Business management, 25% major in mathematics and 10% major in both business management and mathematics. A student from this university is selected at random.

Question

In a university, 30% of the students major in Business management, 25% major in mathematics and 10% major in both business management and mathematics. A student from this university is selected at random. 
A) what is the probability that the student majors in business management or mathematics?
B)  what is the probability that the student majors in neither of these two courses?

bobpursley · Answer

ok, if no dual majors: a. Pr(BMorM)=.30+.25 b. Pr(neigher)=1-Pr(BMorM)