Majoring in business administration another major taken a public speaking class 10 20
not taken a public speaking class 45 25
At a certain college, 100 students were surveyed. The results are in the two-way table above.

One of these 100 students is selected at random to give more detailed answers to some follow-up questions.

What is the probability that the chosen student has taken a public speaking class or is majoring in business administration?
Find the value of P(taken a public speaking class | majoring in business administration).