## Elementary Statistics (12th Edition)

The mean can be counted by summing all the data and dividing it by the number of data: $\frac{4+6\cdot3+7\cdot2+11\cdot1}{25}=1.88$, the mean is 773.667. The mode is the data occuring the most timesand here it is 1, appearing 11 times. The median is the average of the 1 or 2 (here 1) middle data: (2)/1=2, the median is 2. The midrange is the average of the highest and the lowest data: (4+1)/2=2.5, the midrange is 2.5. The measures of centres can be obtained but because the numbers do not have numerical values, the measures of centres do not have any real meaning.