Suppose that 70% of the seniors at a large university have taken calculus, and 30% of the seniors have taken physics. Of the seniors who have taken calculus, 40% have taken physics. A student who is a senior at this university is randomly selected. Define the following events.
A = The student has taken calculus
B = The student has taken physics
-Find P(A?B)
A) 0.70 + 0.30 - 0.40 = 0.6
B) (0.70)(0.30) = 0.21
C) (0.70)(0.40) = 0.28
D) (0.30)(0.40) = 0.12

Question

Quizplus · Accepted Answer

P(A∩B) is the probability that a student has taken both calculus and physics. Since 40% of the students who have taken calculus have also taken physics, P(A∩B) = 0.70 * 0.40 = 0.28.

Suppose That 70% of the Seniors at a Large University