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Do you happen to know which specific test this is?
Do you happen to know if there were 100 questions, or were there a smaller amount of questions?
The problem here is that there are at least 10 different tests given for memory impairment, all with different grading scales.
Memory impairment screen
clock drawing test
Short portable mental status questionaire
without knowing the specific test -- it's impossible to answer here.
But a 74 / 100 generally will mean there is fairly significant memory impairment.
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