A student was performing an experiment that compared a new high protein food to the old food for pigs. He found the mean weight gain for subjects consuming the new food to be 12.8 pounds with a standard deviation of 3.5 pounds. Later, he realized that the scale was out of calibration by 1.5 pounds (meaning that the scale weighed items 1.5 pounds more). What should the mean and standard deviation be for the subjects consuming the new food?

Group of answer choices

The mean should be 11.3, and the standard deviation should decrease

The mean should be 11.3, and the standard deviation should remain unchanged

The mean should be 12.8, and the standard deviation should remain unchanged

The mean should be 11.3, and the standard deviation should increase