Answer :
Answer:
0.97 = 97%
Step-by-step explanation:
The probability of passing at least one is the sum of:
probability of passing history and not passing math,
probability of passing math and not passing history,
probability of passing both of them.
The first one is 0.79 * (1-0.68) = 0.79 * 0.32 = 0.2528
The second one is 0.68 * (1-0.79) = 0.68 * 0.21 = 0.1428
The third one is 0.57.
So, the probability of passing at least one is:
0.2528 + 0.1428 + 0.57 = 0.9656
rouding to two decimal plates, we have 0.97 = 97%