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Hilarious stuff :)

"For example, 81, 82, 84, 85, 87, 89, 91 and 93 were visibly missing. I repeat, no one in India had achieved these marks in the ICSE."

http://deedy.quora.com/Hacking-into-the-Indian-Education-Sys...

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To me the missing values (and nearby spikes) seem like they could be aliasing due to a bad rounding/scaling algorithm.

This is what i thought too, especially since it is visible among all the subjects.

A simple explanation would be extra scrutiny for the answer paper evaluators when marks go beyond 80. That might determine the difference between getting home/hotel at 5:00 P.M or sitting with the supervisor, painstakingly cross checking every answer. Picking answer paper evaluators are like picking people for jury duty in US. Its a lottery system for teachers across the board(In this case across India) and once you get selected, its mandatory to show up at the central evaluation center. The evaluations last something like 10-15 days.

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