The mean of 5 numbers is 4. What happens to the mean if the number 10 is added to the data set? A. The mean increases by 6. B. The mean increases by 5. C. The mean increases by 3. D. The mean increases by 1.r 10 is added to the data set? A. The median does not change. B. The median increases by 2. C. The median decreases by 0.25. D. The median increases by 1.