AP Computer Science A Free Response Practice - Data Analysis and ArrayList - Average Daily Sales

Clock

This single part question is worth 5 points.

AP CSA Alignment

Unit Alignment	Learning Objectives	Resources	Skills
Unit 1: Using Objects and Methods	1.3.C Develop code for arithmetic expressions and determine the result of these expressions.	Declaring and Initializing Variables Applying the Order of Operations Introduction to Arithmetic Expressions Arithmetic Expressions and the Assignment Operator	2.A Write program code to implement an algorithm.
Unit 1: Using Objects and Methods	1.10.A Develop code to call class methods and determine the result of those calls.	Creating Objects and Calling Methods	2.C Write program code involving procedural abstractions.
Unit 2: Selection and Iteration	2.3.A Develop code to represent branching logical processes by using selection statements and determine the result of these processes.	Introduction to Boolean Expressions and Relational Operators Using if Statements	2.A Write program code to implement an algorithm.
Unit 4: Data Collections	4.9.A Develop code used to traverse the elements of an `ArrayList` and determine the results of these traversals.	Introduction to Lists and ArrayList Objects	2.B Write program code involving data abstractions.
Unit 4: Data Collections	4.10.A Develop code for standard and original algorithms for a particular context or specification that involve `ArrayList` objects and determine the result of these algorithms.	Introduction to Lists and ArrayList Objects	2.B Write program code involving data abstractions.

Directions

The Sale class is used to record information about a sale made in a store. A declaraion of the Sale class is shown.

The SalesReport class maintains an ArrayList named sales that contains all the sales at the store for a week. A partial declaration of the SalesReport class is shown.

Write the averageForDay method in the SalesReport class. This method should return the average amount of all sales that occurred on the specified day. If there are no sales for that day, return 0.0.

Suppose report is a new SalesReport object and sales contains the following five Sale objects.

For the sales shown, report.averageForDay("Monday") will return 125.0. There are three sales for Monday. They are 100.0, 200.0, and 75.0. The average is (100.0 + 200.0 + 75.0) / 3 = 125.0.

For the sales shown, report.averageForDay("Tuesday") will return 50.0. There is only one sale on Tuesday.

For the sales shown, report.averageForDay("Friday") will return 0.0. There are no sales on Friday.

Write Your Response

In order to test your program, we have provided some test cases for calls to averageForDay.
Write the code for the method averageForDay in the Java Playground as indicated by the comment add your code here.
All three tests should return true if your code is correct.