There are 3 histograms one with the same height in all colum

There are 3 histograms, one with the same height in all columns, one with two bar the same height but one at an x value of 0 and one at 10, and another histogram with one tall bar at 0. Rank them from smallest to largest standard deviation

Solution

The histogram with one tall bar at 0 will have the smallest sd, the histogram with the same height for all colums will have a larger sd and the histogram with two bar of the se heignt but one at an x value of zero and one at 10 will have the largest sd.