Final answer:
Perpendicular parking involves parking a car at a right angle to the curb, corresponding to option (a). For the additional problems, the expected number of crookedly parked cars out of 22 is 8.25 (option A), and the time it takes to find a parking space is based on a mean of five and a standard deviation of two minutes.
Step-by-step explanation:
The question asks about the correct method to use perpendicular parking. Perpendicular parking is a type of parking in which the parked car is at a right angle to the curb.
Therefore, the correct answer to the question is to park at a right angle to the curb, which corresponds to option (a).
To address the additional information provided:
- Given that 37.5 percent of the cars are parked crookedly in the De Anza parking garage, for every 22 cars surveyed, the expected number of cars parked crookedly would be 22 cars multiplied by 37.5 percent, which equals 8.25 cars. This corresponds to option A.
- The probability that at least 10 of the 22 cars are parked crookedly cannot be determined without additional information or calculations, but the options provided are probabilities and one would typically use binomial probability formulas or a statistical table to find this value.
- The length of time it takes to find a parking space at 9 a.m. that follows a normal distribution, with a mean of five minutes and a standard deviation of two minutes, could be used to approximate that at least 70 percent of the time, it would take more than a certain number of minutes to find a parking space, which would require using a z-score table or a normal distribution calculator.
Mention the correct option in final answer for our initial parking question: Use perpendicular parking to park at a right angle to the curb.