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S1 Work out the mean of Continuous data from table, where have I gone wrong?

Here is my solution:
IMG_20161208_171151.jpg

I have attached the question to the bottom of this post (from physicsmathstutor).

I got the sum of fx to be 1580.5, whilst the mark scheme (I attached it too) got it to be 2055.5. Why did I go wrong? To work out the midpoints, I added the numbers in the class width and divided by two.

Thanks
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Original post by blobbybill
Here is my solution:
IMG_20161208_171151.jpg

I have attached the question to the bottom of this post (from physicsmathstutor).

I got the sum of fx to be 1580.5, whilst the mark scheme (I attached it too) got it to be 2055.5. Why did I go wrong? To work out the midpoints, I added the numbers in the class width and divided by two.

Thanks
Attachment not found

Attachment not found


You did 18 + 29 = 47, when you should have done 18 x 29 = 522

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