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    Im doing Edexcel S1 and what im trying to figure out is when do you exactly add one?

    For example, 15 sets of data.
    Finding Lower Q -> Do i do (15+1)/4
    or 15/4

    Im not sure, I keep getting the answer wrong when i do the papers, can someone tell me when i add +1 and when i dont?
    Thanks
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    hey, to find the quartiles the general rule is that firstly you do n/2 for lower quartile
    if this is an integer then that's it, the lower quartile is that term
    if it isn't an integer value you do n+1/2 if this is an integer then that term is the lower quartile, if this isn't an integer you round up to the next number(this is what i've been taught - edexcel s1 )

    same applies to quartile 2 and 3
 
 
 
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