1. **State the problem:** We need to find the Median (Md), the first quartile (Q1), and the 43rd percentile (P43) for the data set: 60, 70, 50, 80, 90, 100, 110. 2. **Sort the data:** Arrange the data in ascending order: 50, 60, 70, 80, 90, 100, 110. 3. **Find the Median (Md):** The median is the middle value of the sorted data. Since there are 7 data points (odd number), the median is the 4th value. $$Md = 80$$ 4. **Find the first quartile (Q1):** Q1 is the median of the lower half of the data (values before the median). Lower half: 50, 60, 70 Median of lower half (Q1) is the 2nd value: $$Q1 = 60$$ 5. **Find the 43rd percentile (P43):** Use the formula for percentile position: $$L = \frac{P}{100} \times (n + 1) = \frac{43}{100} \times (7 + 1) = 0.43 \times 8 = 3.44$$ The 3.44th value lies between the 3rd and 4th data points (70 and 80). Interpolate: $$P43 = 70 + 0.44 \times (80 - 70) = 70 + 4.4 = 74.4$$ **Final answers:** - Median (Md) = 80 - First quartile (Q1) = 60 - 43rd percentile (P43) = 74.4