How to calculate quant

* \( \{x_i \}_{i=1}^{4n} \) * median: \( \frac{1}{2} (x_{2n} + x_{2n+1}) \) * Q1: \( \frac{1}{2} (x_{n} + x_{n+1}) \) * Q3: \( \frac{1}{2} (x_{3n} + x_{3n+1}) \) * \( \{x_i \}_{i=1}^{4n+1} \) * median: \( x_{2n+1} \) * Q1:\( \frac{1}{2} (x_{n} + x_{n+1}) \) * Q3: \( \frac{1}{2} (x_{3n} + x_{3n+1}) \) * \( \{x_i \}_{i=1}^{4n+2} \) text book * median: median: \( \frac{1}{2} (x_{2n+1} + x_{2n+2}) \) * Q1: \( x_{n+1} \) * Q3: \( x_{3n+2} \) * \( \{x_i \}_{i=1}^{4n+3} \) * median: median: \( x_{2n+2} \) * Q1: \( x_{n+1} \) * Q3: \( x_{3n+2} \)