Mathematics · Data Interpretation

Consider a dataset representing keyboards and mice sold by an electronic shop over 5 consecutive days (D1 to D5). Keyboards sold: D1=30, D2=45, D3=50, D4=65, D5=40. Mice sold: D1=40, D2=55, D3=60, D4=85, D5=70. Which of the following statements is/are correct? I. The number of mice sold on D4 is 40 more than the number of keyboards sold on D2. II. The total number of mice sold on D1, D2, D3, and D5 is 225. III. The ratio of the number of keyboards sold on D1 to the number of mice sold on D3 is 1 : 5.