CBSE 2025 · Region 3 · Set 3 · Q2 · 1 mark
The mean of seven observations is 17. If the mean of the first four observations is $\displaystyle 15$ and that of the last four observations is $\displaystyle 18$, then the fourth observation is :
Official answer
From CBSE’s own marking scheme for this paper.
(B)
$\displaystyle 13$
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CBSE Class 10 Mathematics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.