Average of first 25 numbers is 10 and average of next 25 numbers is 12 . average of all 50 numbers i

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4.Average

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The average of first $25$ numbers is $10$ and the average of the next $25$ numbers is $12 .$ The average of all $50$ numbers is

A

$10$

B

$12$

C

$15$

D

$11$

Solution

Average of all $50$ numbers $=\frac{25 \times 10+25 \times 12}{50}$

Average of $50$ numbers $=11$

Standard 13

Quantitative Aptitude

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