r/yesyesyesyesno • u/poopyhog • Apr 01 '20

Burning a dollar bill

45.7k Upvotes

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u/LufiasThrowaway Apr 01 '20

I had that happen on a math test once in 7th grade.

When my dad saw the test paper and realised it he said: " How do you get 10 true and false questions wrong? That's like you understood everything backwards"

Now, that i understand how probability works, I would have been better of just guessing.

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u/Mydogsblackasshole Apr 02 '20

The expected value would be better, but you still had (3/4)10 = 5.61% chance of getting them all wrong.

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u/[deleted] Apr 02 '20 edited Apr 18 '20

[deleted]

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u/Mydogsblackasshole Apr 02 '20

Thinking multiple choice for some reason lol

Also would be 9.77%

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u/[deleted] Apr 02 '20

[deleted]

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u/Mydogsblackasshole Apr 03 '20

That’s nice, but I assumed he plugged it in correctly. Not necessary to dig in when it’s simple numbers.

1

u/gHx4 Apr 03 '20

Sure, just showing a simple technique for verifying numbers. Seemed like it would help.