Follow us: Follow us on Facebook Follow us on Twitter Subscribe to our newsletter
   

Number Puzzle #30- Grading Glitch -

Share this page on:
Puzzle Image Joe took a math test along with the rest of his class. The test contained 100 questions worth 1 point each. The test scores were registered in a database. But, there was a glitch in the system and for 40% of the tests, the first digit of the test score was replaced by a 5. So, for example, if the test score was 90, it would have been registered as 50 in the database if it had been affected by the system glitch. We know that Joe answered at least 10 questions correctly. His score in the database is registered as 55. If you were given a dollar for every question Joe answered correctly, how much money statistically would you expect to have?

Thank you Armen Hanessian for sending in this original puzzle.

Do you have a suggestion for this puzzle (e.g. something that should be mentioned/clarified in the question or solution, bug, typo, etc.)?