An experiment involves flipping a coin three times.

The following tree diagram shows the possible outcomes for the experiment.

What is the probability of getting exactly 2 tails?

Enter your answer as a reduced fraction, like this: 3/14

The length of time it takes to find a parking space at 9 a.m. follows a normal distribution with a mean of 5 minutes and a standard deviation of 2 minutes. find the probability that it takes at least 8 minutes to find a parking space. (round your answer to four decimal places.)