Mark has been working at QuickLube for six months. He started the job already knowing how to change oil in cars, but now the company is expanding the job to include brake checks and brake replacement. His manager is an expert at all things car-related, so during his shifts for a week, Mark is instructed and his manager assists him in checking and replacing the brake pads on twenty cars. He now feels pretty confident about this new skill because of the hands on training he received. This is an example of:

The food services division of cedar river amusement park inc. is studying the amount families who visit the amusement park spend per day on food and drink. a sample of 40 families who visited the park yesterday revealed they spent the following amounts: see worksheet 1 for data and answer the following questions: a. organize the data into a frequency distribution, using seven classes and 15 as the lower limit of the first class. what class interval did you select? b. what percent of families spent less than $45? c. what percent of families spent $55 or more? d. how many families spent from $65 to 74.99?