Find the mean, median, mode(s), and range of the following data.
20, 17, 10, 31, 25, 18, 12

The correct answer is: Mean: 19, median: 18, mode: none, range: 21

Arranging the data in the increasing order we get,

10, 12, 17, 18, 20, 25, 31

Maximum value = 31 ,minimum value = 10

Range = maximum value - minimum value  = 31 - 10  = 21.

Mean = 

No Mode as all elements occurred once.

The median of the data with 7 elements (7 is odd) is the 4th element.

Median = 18

So, The mean is 19, median: 18, mode: none, range: 21