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19 Oct 2008, 20:23
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How far did Ken jump on his fifth and final attempt in the state long jump finals?
(1) On his final jump, Ken exceeded the average length of his first four jumps by 2.5 feet.
(2) Ken’s final jump increased the length of his average (arithmetic mean) jump from 22.5 feet to 23 feet.
Thanks
(1) On his final jump, Ken exceeded the average length of his first four jumps by 2.5 feet.
(2) Ken’s final jump increased the length of his average (arithmetic mean) jump from 22.5 feet to 23 feet.
Thanks
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19 Oct 2008, 21:56
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Answer is certainly (B).
We need to calculate the length of final jump.
a)It only tells that Ken exceeded the average length of his first four jumps by 2.5 feet.but we don't know about the first four jumps of Ken.
b)It tells Ken’s final jump increased the length of his average (arithmetic mean) jump from 22.5 feet to 23 feet.
This gives that total length of jump of first four was 4*22.5.
and finally the total for five was 5*23.
Hence the length of final jump was (5*23)-(4*22.5) thus B is sufficient.
We need to calculate the length of final jump.
a)It only tells that Ken exceeded the average length of his first four jumps by 2.5 feet.but we don't know about the first four jumps of Ken.
b)It tells Ken’s final jump increased the length of his average (arithmetic mean) jump from 22.5 feet to 23 feet.
This gives that total length of jump of first four was 4*22.5.
and finally the total for five was 5*23.
Hence the length of final jump was (5*23)-(4*22.5) thus B is sufficient.
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
