Answer:
0.85
Explanation:
Using the addition law of probability which states that for two events A and B, the probability that A or B will occur is the sum of their individual probabilities minus the probability that both A and B will occur. The addition rule is given by the formula:
P(A or B) = P(A ∪ B) = P(A) + P(B) - P(A ∩ B)
Let probability that a college freshman takes a math class the first semester = P(A) = 0.75
probability that a college freshman takes an English class the first semester = P(B) = 0.70
probability that a college freshman takes both a math class and an English class the first semester = P(A ∩ B) = 0.60
the probability that a college freshman takes a math class or an English class the first semester = P(A ∪ B) = P(A or B)
Therefore, P(A or B) = P(A ∪ B) = P(A) + P(B) - P(A ∩ B) = 0.75 + 0.7 - 0.6 = 0.85
P(A or B) = 0.85
