The current graph is actively misleading because it misrepresents the data as following a (truncated) normal distribution when that's very unlikely to be the ca

The current graph is actively misleading because it misrepresents the data as following a (truncated) normal distribution when that's very unlikely to be the case. A histogram would show the actual distribution. The kind of graph being used here -- a "best fit" bell curve based on the sample mean/s.d. -- can be useful when overlaid on a histogram, to illustrate how closely the data can be approximated by a normal distribution. Without that context, it's essentially meaningless.