The venn diagram above shows the numbers of students offering music and history in a class of 80 students. If a student is picked at random from the class, ...
The venn diagram above shows the numbers of students offering music and history in a class of 80 students. If a student is picked at random from the class, what is the probability that he offers Music only?
Answer Details
30 - x + x + 40 - x = 80 - 20 70 - x = 60 - x = 60 - 70 - x = - 10 ∴ x = 10 Music only = 30 - x = 30 - 10 20 P(music only) = 20/80 = 1/4 = 0.25