10
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 observation is :
- (a)$14$
- (b)$13$
- (c)$12$
- (d)$10$
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(B)$13$
The mean of seven observations is 17 . If the mean of the first four observations is 15 and that of the last four…
CBSE Class 10 Maths PYQ · Statistics · Mean of Ungrouped Data · 1 Mark · March 2025 · Standard
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