Answer: The probability that the bus arrives on time is 1 - 0.1 = 0.9.
Using the multiplication rule of probability, we can find the probability of both events occurring by multiplying the probabilities of each event.
Therefore, the probability that the bus is on time both days is:
0.9 x 0.9 = 0.81
So the probability that the bus is on time both days is 0.81 or 81%.
Explanation: