&gt; Is it sexism to make assumptions that are probabilistically correct?<p>Yes it&#x27;s sexist, because assuming something about somebody based purely on their gender is precisely what sexism is. However, sometimes, in the face of limited data and limited resources to gather more data, being sexist might be the best possible course of action.<p>The problem with the stereotypes of gender is that you are dealing with huge numbers of people. Even if a well-conducted survey reveals that 99.9% of women prefer frozen yoghurt to pizza, then there&#x27;s still around 3.5 million women in the world that prefer pizza to frozen yoghurt.<p>So the best possible way to decide whether to buy pizza or frozen yoghurt for a woman is to ask her. However, if you had to make a snap decision then, yes, you should go with the statistically more likely option and if you get it wrong then she should understand why you did it.