Over the past 10–20 years, the use of landline phones has fallen while the use of cell phones and smartphones has increased. Explain how changes in consumer tastes and preferences are affecting the demand functions for each product. Draw graphs for each of the two products (landlines and cell phones/smartphones) illustrating what has happened to the demand curve for each one.

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?