OCR S1 May 2006 Q7 - mean and standard deviation
Please may someone help to answer Q7a:
https://pmt.physicsandmathstutor.com/download/Maths/A-level/S1/Papers-OCR/June%202006%20QP%20-%20S1%20OCR.pdf
I don't know how to find the mean and standard deviation for this data.
https://pmt.physicsandmathstutor.com/download/Maths/A-level/S1/Papers-OCR/June%202006%20QP%20-%20S1%20OCR.pdf
I don't know how to find the mean and standard deviation for this data.
(edited 2 years ago)
Reply 1
16
If it asks you to estimate it in this type of question, the best thing to do is to try to find midpoints for each of the groups (this is hinted by the "Assuming that ‘At least 60 minutes’ means ‘At least 60 minutes but less than 240 minutes’".
Once you find the midpoints, just treat the mean as it is normally
Once you find the midpoints, just treat the mean as it is normally
Reply 2
Original post
by JJPSWFCIf it asks you to estimate it in this type of question, the best thing to do is to try to find midpoints for each of the groups (this is hinted by the "Assuming that ‘At least 60 minutes’ means ‘At least 60 minutes but less than 240 minutes’".
Once you find the midpoints, just treat the mean as it is normally
Once you find the midpoints, just treat the mean as it is normally
Thank you very much, now I understand it
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