AP ICET 2017 Shift 1 Paper

Question : 141 of 200

Marks: +1, -0

The arithmetic mean of 100 observations is 10. Of these the arithmetic mean of the first 25 observations is 12 while that of the last 65 is 9. The arithmetic mean of the remaining 10 observations is

10
11
11.5
12.5

Validate

Solution:

Sum of 100 observations

=100×10=1000

Sum of first 25 observations

=25×12=300

Sum of last 65 observations

=65×9=585

∴ Arithmetic mean of remaining 10 observations

={1000-300-585}/10=115/10=11.5

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