Answer
Since the histogram is roughly symmetric, we expect the mean to be close to the median. To calculate the mean, we sum all of the values and divide by the number of observations:
Mean =$ \frac{290+420+....+580}{48} = 563.125$
Since the data set has even number of values, we divide the middle two values to get the median:
Median =$ \frac{560+560}{2} = 560$
Work Step by Step
Since the histogram is roughly symmetric, we expect the mean to be close to the median. To calculate the mean, we sum all of the values and divide by the number of observations:
Mean =$ \frac{290+420+....+580}{48} = 563.125$
Since the data set has even number of values, we divide the middle two values to get the median:
Median =$ \frac{560+560}{2} = 560$