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Confused with interquartiles?

So for median lets say, when exactly should I use
n+12 \frac{n+1}{2} or n2 \frac{n}{2}

When it comes to questions with a list of numbers I use n+12 \frac{n+1}{2}

But when it comes to tables with grouped data, I don't know which one to choose from.

Here in the CGP, we have a grouped data (with gaps)
And we are asked to estimate the median using linear interpolation.
And they usedn+12 \frac{n+1}{2}


But then there's a similar question [where we also have a grouped data (with gaps)], and we are asked to estimate the median using linear interpolation, but this time he used n2 \frac{n}{2}

Why's that?
(edited 8 years ago)
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If you're looking for the correct formula use , and if the value is a decimal simply round it.:smile:
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Avatar for Adorable98
Adorable98
OP
15
Bump!

Could you please answer me @SeanFM @TeeEm :smile:
(edited 8 years ago)
Reply 3
Avatar for Adorable98
Adorable98
OP
15
Original post by Mayhem™
If you're looking for the correct formula use , and if the value is a decimal simply round it.:smile:


So, was the CGP wrong? I tried using n2\frac{n}{2} and I got a different answer! :s-smilie:
Reply 4
Avatar for TeeEm
TeeEm
19
Original post by Adorable98
Bump!

Could you please answer me @SeanFM @TeeEm :smile:


sorry I am teaching

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