The mean of 100 values is 45. Total of 100 values = 45 × 100 = 4,500 5 is added to the first forty values. So, 15 × 40 = 600 5 subtracted from each of the remaining sixty values = 5 × 60 = 300 So, the new values = 4,500 + 600 - 300 = 4,800 New mean =