The x-axis represents the trial, and the y-axis represents the number of defective lightbulbs.

For quality control, a company that manufactures lightbulbs conducted five different trials. In each trial, 500 different lightbulbs were tested. The bar graph above shows the number of defective lightbulbs found in each trial. If a sixth trial was conducted and 5 defective lightbulbs were found, what would be the new mean number of defective lightbulbs for all six trials?