Final answer:
a. The median remains 12 attempts. b. The mean will be lower than 11.5 attempts.
Step-by-step explanation:
a. The median represents the middle value in a data set when the values are arranged in numerical order. Removing 2 attempts from the data set will not change the position of the middle value, so the median will remain the same at 12 attempts.
b. The mean represents the average of a data set and is calculated by summing all the values and dividing by the total number of values. Removing 2 attempts will decrease the sum and also the total number of values, resulting in a lower mean than 11.5 attempts.