According to the Myers-Briggs organization who conducted an official random sample in 1998, Introverts are 50.7% and Extroverts are 49.3% of the US population. Males are 54.1% Introverts and 45.9% Extroverts.. Females are 47.5% Introverts and 52.5% Extroverts. Source: Myers, I. B., McCaulley, M. H., Quenk, N. L., & Hammer, A. L. (1998). MBTI Manual: A guide to the development and use of the Myers-Briggs Type Indicator (3rd ed.). Palo Alto, CA: Consulting Psychologists Press. The reason for the confusion is explained at