Computing percentiles
You have computed the mean, minimum, and maximum transaction amounts of sample coffee sales. Now find the median, 25th, and 75th percentiles of the transaction amounts formatted to two decimal places.
| date | coffee_name | payment_method | quantity | amount |
|---|---|---|---|---|
| 3/1/24 | Latte | cash | 1 | $6.26 |
| 3/5/24 | Hot Chocolate | card | 3 | $32.51 |
| 3/6/24 | Americano | card | 2 | $18.70 |
The necessary packages such as LocalDate, Arrays, List and DescriptiveStatistics have been imported for you.
이 연습은 강의의 일부입니다
Cleaning Data in Java
연습 안내
- Compute the median transaction amount, or the 50th percentile, of the coffee sales.
- Compute the 25th and 75th percentiles of the transaction amounts.
실습형 인터랙티브 연습
이 예제를 이 샘플 코드를 완성하여 풀어보세요.
public class CoffeeSalesExample {
private record CoffeeSales(LocalDate date, String coffeeName,
String paymentMethod, int quantity, double amount) {
}
public static void main(String[] args) {
List sales = Arrays.asList(
new CoffeeSales(LocalDate.of(2024, 3, 1), "Latte", "cash", 1, 6.26),
new CoffeeSales(LocalDate.of(2024, 3, 5), "Hot Chocolate", "card", 3, 32.51),
new CoffeeSales(LocalDate.of(2024, 3, 6), "Americano", "card", 2, 18.70));
DescriptiveStatistics stats = new DescriptiveStatistics();
sales.forEach(sale -> stats.addValue(sale.amount()));
System.out.printf("\nSales analyzed: %d%n", sales.size());
System.out.printf("Average amount: $%.2f%n", stats.getMean());
System.out.printf("Amount range: $%.2f - $%.2f%n",
stats.getMin(), stats.getMax());
// Compute the median transaction amount
System.out.printf("Median amount: $%.2f%n", stats.____(____));
// Compute the 25th and 75th percentiles of the amounts
System.out.printf("Normal range: $%.2f - $%.2f%n",
stats.____(____), stats.____(____));
}
}