Fifty Is Average: The Number Japanese Students Carry — Epoche B1
Hensachi is a number that a Japanese teenager preparing for entrance exams knows about themselves: 58, perhaps, or 47. It is a deviation score, and it says where you stand against everyone who sat the same mock exam. Fifty means exactly average. The arithmetic is simple: $$\text{hensachi} = 50 + 10 \times \frac{x - \bar{x}}{s}$$ Here $x$ is your mark, $\bar{x}$ is the average mark of everyone who sat the paper, and $s$ measures how widely the marks are spread. So a mark of 70 out of 100 can be a hensachi of 65 on a hard paper and 52 on an easy one. The number describes your place, not your knowledge. The scores come from national mock exams run by cram schools and testing companies. Hundreds of thousands of students sit the same paper on the same day; a few weeks later a sheet arrives at home. On it is your number, and beside it a list of schools, each with a number of its own and a percentage chance that you would be admitted. That sheet is where a measurement becomes a decision. Once students and schools wear numbers on one scale, the question quietly changes shape. "Where do I want to go?" becomes "where does my number reach?" Teacher, parent and student are all reading the same table, so the discussion is short and rarely unkind. Nobody has to say no; the column says it. It is easy to call this cruel, and sometimes it is. Yet the scale is also oddly fair. A student in a small town, with no useful relatives, learns exactly where they stand, and the number cannot be charmed. What it cannot measure — what a person is actually for — never appears on the sheet at all. That silence is the part worth noticing. References McCall, W. A. (1922). How to Measure in Education. New York: Macmillan. Rohlen, T. P. (1983). Japan's High Schools. Berkeley: University of California Press. Amano, I. (1990). Education and Examination in Modern Japan. Tokyo: University of Tokyo Press.