Answer:
Median
Step-by-step explanation:
Mean of 10 numbers = 260/10 = 26
Mean of 11 numbers = 286/11 = 26
No change
Median:
Median for 10 numbers
12 , 14, 15 , 17 , 19 , 27, 29 ,37 , 45, 45
Median = 19+27/2 = 46/2 = 23
Median of 11 numbers
12 , 14, 15 , 17 , 19 , 26, 27, 29 ,37 , 45, 45
Median = 26
Median changes the most