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Maths puzzle that's driving me nuts!


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Ever stared at a simple maths puzzle and kicked yourself repeatedly for not being able to figure it out?

 

Here goes....

 

What is the average file grade?

 

Grade 1 - 1 file

Grade 2 - 10 files

Grade 3 - 4 files

Grade 4 - 13 files.

 

I've tried the obvious thing of adding them all up and dividing by 4, but that gives me 7. I'm looking for an answer somewhere around Grade 3 point something.

 

How the heck do I do this?

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Ever stared at a simple maths puzzle and kicked yourself repeatedly for not being able to figure it out?

 

Here goes....

 

What is the average file grade?

 

Grade 1 - 1 file

Grade 2 - 10 files

Grade 3 - 4 files

Grade 4 - 13 files.

 

I've tried the obvious thing of adding them all up and dividing by 4, but that gives me 7. I'm looking for an answer somewhere around Grade 3 point something.

 

How the heck do I do this?

 

Multiply the grade by the number of files with that grade ie 1 x 1, 2 x 10 etc.

Add up the 4 figures. Divide by the total number of files.

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