Final answer:
The proper distance for parallel parking is undefined, but one can calculate average statistics and probabilities regarding parking behavior and time spent finding parking spots using provided statistical distributions.
Step-by-step explanation:
The proper distance when parallel parking is not numeric and specific -- it varies depending on the situation and the size of the parking space. However, the provided statistics on the De Anza parking garage indicate that for every 22 cars, on average, 8.25 are parked crookedly, as 37.5 percent of 22 cars equals 8.25. To find the probability that at least 10 of the 22 cars are parked crookedly, one would typically use binomial probability calculations, which are not provided here.
As for the time it takes to find a parking space, since 70 percent of the time, it takes more than 2.41 minutes to find a parking space, and the time to find a parking spot at 9 a.m. follows a normal distribution with a mean of five minutes and a standard deviation of two minutes. Finding a parking space in less than one minute would be a rare event and likely deemed surprising, given the mean time of five minutes. Lastly, the probability of it taking at least eight minutes to find a parking space would be calculated using the normal distribution, with b being the answer most likely referring to 0.9270, which is the complement of the probability of taking less than eight minutes.