Answer:
It is median.
Step-by-step explanation:
a) The mean is the average of all the numbers: (81+87+93+89+61+81)/6= 82
b) The median is the middle value when the numbers are arranged in ascending order.
61,81,81,87,89,93
since it's an even number, we take the two middle numbers, in our case 81+87=168/2=84
c) The mode is the most frequent data, which in our case is 81
d) It would be the median because it has the highest grade he could get from the other options.