Can someone please point me to a resource where I can find the mean and standard deviation for real life data, for example the wingspan of an eagle or the weight of an elephant or anything meaningful. I can easily find data for the mean, but not for the standard deviation. I am trying to come up with questions about normal distribution for high school students. I can of course make up the numbers, but it would be better to have the numbers reflecting the actual facts.
There are many open datasets around. For instance, the Iris data set, and more searchable at UCI Center for Machine Learning and Intelligent Systems, from which you can compute your own average and deviation.