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