At the high school level you don't really know what you'll be doing 15 years later? You should have a complete grounding, so that you can make those decisions and not have to play catch up later on. I am not saying probability and stats are less important (probability is as important and increasingly stats), but you need calculus as well, at least a good basic grounding.

Agreed, but that is not the question. I would love to see everyone holding a diploma walking out with some knowledge of both calculus and statistics.

The question is given limited time in school, which is more important and useful for the average person? I think the answer is statistics and probability. People confront probability and statistics in the news all the time and make practical decisions based on what they think is more likely. Most people can apply probabilities in their daily life, few people in nontechnical fields will use calculus.

I brought up my own experiences to point out that as a former military analyst and current DBA and programmer I have used basic statistical knowledge on a regular basis. I have used knowledge of Calculus so little in my daily life and job that I had to give myself a very thorough refresher when I returned to an academic study of mathematics.