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# Maths, S1, Linear Interpolation question watch

1. Hi,
When doing linear interpolation (say to find the median of a grouped frequency table) what do you do in the case where the value you are looking to find is also one of the cumulative frequencies?

E.g. you are looking to find the median, and divide N/2 to find the value corresponding to the median is say 50. However you then find that one of the cumulative frequencies is also 50. I'm not sure how to interpolate the group when this happens.
2. (Original post by h1347698)
Hi,
When doing linear interpolation (say to find the median of a grouped frequency table) what do you do in the case where the value you are looking to find is also one of the cumulative frequencies?

E.g. you are looking to find the median, and divide N/2 to find the value corresponding to the median is say 50. However you then find that one of the cumulative frequencies is also 50. I'm not sure how to interpolate the group when this happens.
Could you please find an example of a question like this?

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