The graph shows a distribution of data. What is the standard deviation of the data? 0.5 1.5 2.0 2.5

From the graph, it can be seen that the distribution is a normal distribution represented by a bell-shaped curve which is divided into approximately 3 standard deviations either side of the center.

From the graph, it can be seen that each sub-division either side of the center is 0.5 units.

Therefore, the standard deviation of the data represented in the distribution is 0.5