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The average of 25 results is 18. The average of first 12 of those is 14 and the average of last 12 is 17. What is the 13th result?
Answer & Solution
Correct Answer:
Option
D
Sum of 1st 12 results = 12 × 14
Sum of last 12 results = 12 × 17
13th result = x (let)
Now,
12 × 14 + 12 × 17 + x = 25 × 18
Or, x = 78
Sum of last 12 results = 12 × 17
13th result = x (let)
Now,
12 × 14 + 12 × 17 + x = 25 × 18
Or, x = 78
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LoginSum of first 12 results= 12×14=168
Sum of last 12 results= 12×17=204
So, 13 th result =( 450- 372)= 78