The mean is found by adding together all of the numbers, then dividing that number, by how many numbers you have. (In this case it would be 68.7 divided by 24 which is 2.8625). This means 2.8625 is the average/ mean.
The median is found by lining all the numbers you have up from least to greatest. Then you cross out one on each side and continue crossing until you reach the middle. In this case, the median would be 1.4.
The correct answer is c, only the mean will increase