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maths a level help

https://www.mathsgenie.co.uk/alevel/as-level-statistics-oct2021ans.pdf

for question 2b i worked out median age manually and i used calculator to match my answer. however i get different answer for each why is that so?? i used x value as midpoint in my calculator am i doing something wrong w my calculator or is this specific case where i cant rely on my calculator

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