Burger king calories 320
del taco calories 280
mcdonalds calories 280
jack in the box calories 250
wendy's calories 270

find the mean number of calories for the hamburgers.
and the median number of calories for the hamburgers

Arrange them from least to greatest form

250 cal., 270 cal., 280 cal., 280 cal., 320 cal.,

Mean = 
(5 because there is a total of 5 fast food restaurants' hanburgers)

          = 
Mean = 280 calories

Median = The number exactly in between,
In midst of these numbers, 280 is in the mid-way
Median = 280 calories