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zaterdag, december 03, 2022

Why 50% of MIT students get the bat and ball problem wrong

1. The Bat and Ball Problem


  • A bat and a ball cost $1.10.
  • The bat costs $1.00 more than the ball.
  • How much does the ball cost?

First Reaction:

Nearly all people have a first reaction of 10 cents which is wrong. The correct answer is 5 cents.

In a study of 3,428 university students, 50% of participants across Harvard, MIT and Princeton gave the incorrect intuitive response and did not actively check their response. A failure to check is instructive because it requires such minimal mental effort.