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grouped data

where does each number come from the calculation of question 7iii)

http://mei.org.uk/files/papers/s108ju_rfs6.pdf
the mark scheme is on the same site
Original post by esmeralda123
where does each number come from the calculation of question 7iii)

http://mei.org.uk/files/papers/s108ju_rfs6.pdf
the mark scheme is on the same site


DO you mean the numbers in the table in the question?
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debbie394
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Original post by Muttley79
DO you mean the numbers in the table in the question?


i mean this:


Estimate median = (30) + 145/570 × 10
Original post by esmeralda123
i mean this:


Estimate median = (30) + 145/570 × 10


OK so you knowthe median is between 30 and 40? They have used interpolation ...

570 = 1810 - 1240 [CF of 40 - CF of 30]
145 = 1385 - 1240 [where the median is - previous CF]

10 is that group width

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