You're on the right track. The only thing you're missing is that adding (averaging) two bell curve distributions that are offset by a little does not necessaril

You're on the right track. The only thing you're missing is that adding (averaging) two bell curve distributions that are offset by a little does not necessarily give a bimodal distribution. It will only be bimodal if the two unimodal that you are adding are placed far enough away from each other. See this https://stats.stackexchange.com/questions/416204/why-is-a-mixture-of-two-normally-distributed-variables-only-bimodal-if-their-mea https://stats.stackexchange.com/questions/416204/why-is-a-mi...