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The mean is the average of all the numbers.

(A + B + C + D)/4 = 56

The median is the number in the center of a list of numbers that are in numerical order.

A, B, C, D, E, F, G

The median would be D

A, B, C, D, E, F, G, H

If there are two in the center, average the two - (D+E)/2

The mode is the number that is duplicated the most.

A, A, B, C, D, D, D, E, E, F, G

D would be the mode of this set because it is repeated 3 times.

(A + B + C + D)/4 = 56

The median is the number in the center of a list of numbers that are in numerical order.

A, B, C, D, E, F, G

The median would be D

A, B, C, D, E, F, G, H

If there are two in the center, average the two - (D+E)/2

The mode is the number that is duplicated the most.

A, A, B, C, D, D, D, E, E, F, G

D would be the mode of this set because it is repeated 3 times.