Suppose the probability that you receive a distinction or higher in marketing is 0.91 and the probability that you receive a distinction or higher in microeconomics is 0.79. If it can be assumed that your performance in one course does not influence your performance in the other, what is the probability that you will receive a distinction or higher in at least one of these courses? (correct to 3 decimal places)
Question
Suppose the probability that you receive a distinction or higher in marketing is 0.91 and the probability that you receive a distinction or higher in microeconomics is 0.79. If it can be assumed that your performance in one course does not influence your performance in the other, what is the probability that you will receive a distinction or higher in at least one of these courses? (correct to 3 decimal places)
Solution
The probability of receiving a distinction or higher in at least one of these courses is the complement of the probability of not receiving a distinction or higher in either of the courses.
The probability of not receiving a distinction or higher in marketing is 1 - 0.91 = 0.09. The probability of not receiving a distinction or higher in microeconomics is 1 - 0.79 = 0.21.
Since the performance in one course does not influence the performance in the other, we can multiply these probabilities together to find the probability of not receiving a distinction or higher in either course:
0.09 * 0.21 = 0.0189
Finally, we subtract this probability from 1 to find the probability of receiving a distinction or higher in at least one course:
1 - 0.0189 = 0.9811
So, the probability that you will receive a distinction or higher in at least one of these courses is 0.981, to three decimal places.
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