The bar chart displays the number of books read by five students in a month. After calculating the mean and median, a teacher finds that Student C actually read books. Which of the following statements describes the change in the mean and median after the correction is made?
.
The mean decreases by and the median decreases by .
The mean decreases by and the median decreases by .
The mean decreases by and the median decreases by .
The mean decreases by and the median does not change.
The mean decreases by and the median decreases by .