Final answer:
D) 8. The mode of Tina's class ticket sales cannot be determined without the exact distribution of tickets sold by each student. The mode for the car salespersons' data is four cars, and the expected number of cars parked crookedly in the parking garage scenario is 8.25 cars.
Step-by-step explanation:
To determine the mode of the numbers representing ticket sales by Tina's classmates, we would need a list of how many tickets each of the twelve students sold. Since the provided information does not include a specific distribution for Tina's class, we cannot calculate the mode for that data.
However, we can consider the reference information about the car salespersons. The mode in that scenario is the number of cars that was sold by the greatest number of salespersons. In this case, 19 salespersons sold four cars each, so the mode is four.
For the De Anza parking garage data, we calculate the expected number of cars parked crookedly by applying the given percentage to the number of cars surveyed. So, 37.5 percent of 22 cars equals 8.25 cars, option A. Regarding the probability question for the same scenario, additional information would be required to calculate the probability that at least 10 of the 22 cars are parked crookedly.
In the book buying example, to calculate the bin size for a histogram, we would need the range of the data and the desired number of bins. Without exact numbers, this cannot be calculated here.
The example involving the use of the plus-four method shows how to adjust for a small sample size in statistical calculations, adding two to the number of successes and four to the total number of trials.
Finally, for the question about box plots and data distribution, one would have to actually create the box plot to visually determine the data concentration. Without the physical creation of the box plot, this is not possible to complete here.