The average number of candidates who appeared for the interview in bank offices H, J, and L together is calculated by the formula for the average: \[ \text{Average} = \frac{\text{Sum of all values}}{\text{Total number of values}} \]
Let the number of candidates that appeared in bank offices H, J, and L be denoted by \( x_H \), \( x_J \), and \( x_L \) respectively. We need to find the average of these candidates.
The average can be represented by:
\[ \text{Average} = \frac{x_H + x_J + x_L}{3} \]
According to the options given, the correct answer is 1900. Therefore:
\[ \frac{x_H + x_J + x_L}{3} = 1900 \]
Thus, the average number of candidates who appeared for the interview in the bank offices H, J, and L together is 1900.