Mr. battles raised all of his students' scores on a recent exam by 555 points. what effect did this have on the mean and standard deviation of the scores?

A) The mean increased by 5 points, but the standard deviation remained the same

Explanation: The mean is the average value of the numbers in a data set. Adding 5 points to each score would increase the average value by 5 points.

In a data set, standard deviation measures the amount of variation from the mean. A low standard deviation indicates that the data points tend to be close to the mean and a high standard deviation indicates that the data points are far away from the mean.

Adding 5 points to each test score would shift the points to the right, but the points would still have the same distances between each other. Therefore, the standard deviation would remain the same.